During that spell of -C temperatures we set our h.p. to come in cheap rate and heat at 0130am to 18C. Then set to heat to 19C at 0330am with back to 17C at 0430am. Set to 20C at 0640am for rest of day until 9pm - back to 17C. It works for us.

I think your setup did really well. Mine was working hard also and I had zero issues. I would worry about a 2010 winter though and the sheer length of that cold snap, but as you said the gas boilers were also working hard. Great analysis and great to see it all laid out.

Thanks, Tom. That was so informative. I have just started my heat pump journey. Waiting for a survey from Octopus. I am nervous about getting rid of gas but I know it is the right thing to do. Looking at your stats reassures me that although it is more expensive to run during really cold spells, it is not outrageous. As you are an early adopter, you are giving snails like me the confidence to proceed. Thank you.

In the south of UK we also had a cold snap, (-5'C) in the middle of which the heat pump defrost failed and the cost skyrocketed form £8 per day to £17.50 on investigation the K type sensor had failed replaced it (an easy job) and back to normal, I will say that this a 10 year old heat pump and the first time it has failed, The lesson learnt is that if one is competent with a multimeter and the unit is out of warranty a bit of self help is to have a spare thermocouple at hand as they are usually generic so that so that you or your service engineer could replace it saves time waiting for spares The thermocouple are usually under £20.

Brilliant video as always Tom! I've been filling up my scatter graph ready for the big reveal once I've collected the full month of January. I've got some similar findings to you from the not so sunny south!

Very informative and balanced video. The figures you gave out and analysis were very helpful.

I found this very interesting. I live in Switzerland and I have owned properties with air/water heat pump heating for 30 years. Here in winter it's not unusual to have temperatures under zero even for weeks on end and of course that has traditionally driven house design and insulation standards. My memories of UK building standards from my childhood (single glazing, air gap brick walls, suspended wooden flooring, poorly closing doors and windows) are seriously at odds with the need for good thermal insulation. So I am curious to know how well Tom's house is insulated. Our current Swiss standards stipulate triple glazing, limiting window area, 15 to 20 cm thermal foam on outside walls, very well sealing windows, thick, insulated outside doors and much more. My typical inside temperature is about 23⁰C If the sun is shining, I maximise solar warming from large glazing on our south-facing façade and minimise heat loss in darkness by closing curtains and outside blinds. Similarly in summer I have to limit solar heating of the house with blinds and curtains and ingress of hot outside air by keeping windows andndoors closed to keep the ambient inside temperatures below 27⁰C as far as possible. With high summer temperatures reaching 37⁰-39⁰C, my balcony (with thick glass) and my garden patio regularly reach over 45⁰C in summer. Half of my north-facing façade is covered by my unheated garage which itself never seems cooler than 0⁰C and surely prevents further cooling of the house in winter. Jn summer it is almost always in shade. Bottom line: there's a lot more to maintaining comfortable living temperatures than meets the eye. My gut feeling says that Tom's heating need is very high for only 20⁰C temperature difference between inside and outside temperatures and I wonder what more can be done to reduce heat loss and therefore heat consumption to maintain a constant temperature. Many thanks for the video and all the best, Rob in Switzerland PS. I should perhaps add that my heat pump is located in my service cellar with the 300 litre boiler, water softener, electrical fuse board, house ethernet network rack and central cable TV distribution point. This cellar is unheated but is rarely cooler than 18⁰C, probably profiting from the ground-floor underfloor heating as its ceiling.

thanks Tom, this was the one I was waiting for You have me convinced now

Really great to see a no-nonsense report on real-world heat pump usage. Currently on a conventional gas boiler system, and planning heating options after a refurb. At time of this comment, Octopus tracker is 15.21p/3.79p for elec/gas respectively, vs price cap prices of 28.62p/7.42p. In both cases as about 4x. However, it seems that overall the COP evens this out, and it wouldn't be a deal-breaker to pay more than gas would for a few weeks of the year. And great to highlight exactly how much this reduces CO2 emissions.

Interesting stuff Tom. That week our gas bill was £6.50 for heating only, flow temp on boiler 45 degrees and internal thermostats on 19 degrees. Was all cosy as well. Shows it should be all good for a heat pump this year!!!

19 degrees??? I’d have to keep my coat on in the house!

Great vid. I’m on the cusp of investing. So your channel is helping a lot.

Our experience, on my diy install: Costs no more than we used to spend on gas, house has been extended by 15m2 and is now warmer than it was before. And we’ve removed the combustion appliance from inside the house. Win win

£8:46 for our gas boiler on the 17th Jan but not as cold here, your accounts help re ASHP so please keep up the good work

Same sort of weather in northern Brittany last week. Typical weather we use around 16kWh per day to heat our house to 21 in a windy location by the sea. Last week peaked at 64 kWh one day, average around 55 kWh. Wet snow and high humidity meant quite a lot of defrost cycles!

My one bedroom flat has three storage heaters on tariff 7 but only use two of the three heaters. My heating cost including hot water cost me no more than £3 per day during the cold snap and £2 per day when outside temperature rise above 40°f. These costs are based on keeping my indoor temperatures above 70°f and very rarely drops below.

My MR. Cool worked just fine no issues whatsoever. This is year 2 for my mr. Cool...

Really inserting, Tom! Just looking at our stats - we used 34 & 36kWh (1950s 3 bed end terrace) on the 18th & 19th, but we paid about the same as you*. We're on Octopus Cozy. Similar settings to you - we have a fall back of 18.5C and aim for 20C before 4pm. That said... our efficiency is around 4.5-4.8 which I'm really happy with. Just need to get our bills down a bit. Good work! *Though my price includes all energy - cooking, lighting, charging, etc. - £9.90 on the 19th. Maybe not so bad.

Very interesting. Our heat pump was commissioned on the 18th so it had to work hard from day one with a COP of 3.8. It wasn't too expensive it used 27Kwh to keep us at 20C and cost us £4. Since then I've tweaked the settings and improved the COP but of course it's been warmer so I don't really know how much better. Our cheapest day so farwas the 25th at 48p but we had a lot of power from our solar panels , I'm hoping to heat for free soon.

Thanks Tom, most interesting. I thought you might like to hear my experience over the same 5 days just down the road in York. I keep my house considerably cooler than you (15 during the day and 13 overnight). I used 75 kWh total in the house (heat pump by far the biggest consumer) and on the Agile tariff it cost me £12.13 (exc. standing charge and VAT). To my regret I haven't been monitoring the COP but intend to do so. I only recently installed the ASHP (Ecodan) so have been very cautious with temp settings. Now I intend to start easing it up a little and maybe remove a layer or two of clothing!

Interesting analysis. Our air to water heat pump is now 20years old and still gives good efficiency - even at -22degC (I live in Norway), but I think we are almost at a CoP of just over 1 at that low temp. Heat pumps have definitely improved the last years and we like a warmer house than you 😂. All I can say is the uk climate is mild and is absolutely perfect for heat pumps.

Hey Tom, great videos keep up the good work! I have a question, what's the rough heat loss of your property so I can compare roughly to mine? :)

Love the data against temperature, do a comparison to the data sheet of the 5kw unit, see if you are close. The opentherm site with quite a few heat pumos on is very interesting cops of 2.6 at -3. Keep it up useful information

Good video. I have an 3.5kW ASHP in my 2 bed flat, it cost me £2,000 fitted, it heats the whole flat to 20 - 21°C. From 7am to 11pm, it is off at night. I'm all electric (so no gas) and my average daily usage is 10 to 12kWh at -2°C less when it is above freezing outside during the winter months. My total annual usage is about 2700kWh. I would like a battery but I don't think in my situation I would save very much money. I'm on a fixed day rate with no economy 7. Compared to the underfloor heating I used to use I'm saving nearly £1,000 per year. A bad - cold month will cost me about £90 not including the daily charge. I'm lovely and warm all day, I dry my clothes indoors with zero condensation. Trickle vents on all windows are open, it also collects dust for me, I clean the filters every month - it takes a few minutes. In the right setting these ASHPs are a no brainer.

Our heat pumps still keeping house warm (21c) at -27c A efficiency of 1.6. Still better than restive electric heat. Senville (Midea) heat pumps.

Great video. Our Samsung HTQ Mono was working hard too and looking at the electricity use on a daily basis was a bit scary but were warm and not burning oil (we are off the gas grid). We are on Octopus Cosy and I am beginning to wish I had been braver and gone with Agile.

Thanks for the update; good to hear you're still happy with the system. Have you considered getting an Open Energy Monitor heat pump monitor? It provides finer-grained monitoring and more accurate temperature and flow measurements ... perfect for data-geeks. Also echoing other comments it would be great to know what the flow/return temperatures are, and whether there are particular rooms which the radiators struggle to warm and other rooms which are too warm (i.e. can radiator replacements or balancing lower the flow temperature).

Thank you for the information. I live in a rural location in 150 years old house. However, very interesting to hear that these pumps can actually achieve decent temperatures, admittedly only with a hermetically sealed house with zero fresh air flow, but I have previously been led to believe that the best you could have was 15 degrees C, even with modern excellent insulation. So thank you for exploding one myth 😅. We are switching to Solar and wind with batteries and planning on an electric Aga plus wood burning stoves. The wood is free but disappointed with the current propaganda that if you have a wood burning stove ergo you are a bad person! However, we enjoy all the other positive aspects of burning wood. We currently paying 31p per unit for electricity (£150+/month) and around £1500 per annum on kerosene. So, looking forward to becoming more independent from the Grid.

You're right about one thing living in northwestern Canada, those temperatures would be considered balmy and your heat pump a joke in the winter. My idea of air-conditioning in the warmest of summer days is a T-shirt and shorts with an electric fan to circulate the air with open windows if no regional fires are outputting smoke. The coldest day sofar this winter was -40°C without the windchill. Today's high of +7°C and the last few days readings highs above 0°C make feel like a lovely spring day, we're just waiting for the other shoe to drop.

I switched from an oil boiler to air source and solar panels. 1950s house and average insulation in a rural part of the UK with no gas supply. The previous year I spent £90 a month on electricity and £1,500 on oil. With the pump and panels my electricity bill is now averaged out at £130 a month, a saving of £1,140 for the year. House is now set to 20 degrees 24/7 on a low weather compensation curve. Not sure if it's worth the switch over gas, but it is worth it over oil in my personal experience.

Nice video. Any recommendations on what brands are solid for heat pumps?

Hi Tom, Got a 300m2 house in Warsaw, NIBE Heat pump supplying an underfloor heating and hot water. We have had a cold two 4 week spells of -10C weather . I optimise the heat pump to operate for underfloor heating during the warmest part of the day, ideally from 10am to 5pm. How water function would be am and pm and the average cost is approx €300/month.

Tom, very good presentation. Not sure if you have covered this before so apologies. What was your calculated heat loss prior to installation of the ASHP, what size (capacity) is your heat pump - and during the period of this covered what was the heat loss at designed outside temperature (DOT). This a long way round to saying I am interested in how accurate your heat loss calculation was.😉?

We just keep our hall thermostat at 19 degrees 24 hours and regulate individual rooms with radiator thermostats (with the gas boiler we used to reduce to 17 degrees at night) . We have also set the central heating pump to its lowest speed and let the heatpump regulate flow temperature via its AI setting - hotter in cold weather, cooler in warmer weather. On Cozy Octopus , and this winter also coupled with a battery , our energy bills are very low, despite the high usage on the coldest days. But even without the battery last winter, our bills weren't any higher than neighbours in same houses with gas. And there are no cold spots in the house, and absolutely no condensation on any windows now, resulting in a much more pleasant indoor climate. Halfway through our second heatpump winter, I would never go back to a gas boiler.

This is a really interesting analysis of a real situation. I live in the Netherlands and the coldest 24 hour period was on the 10th of January with a -5.5°C average and -9,1°C low. I heat with split AC units, the house is detached and 210m² so it's quite large. I still managed a total electricity use of 38,6 kWh, that's including all electricity use. Average on a summer day is 5-6kWh, so around 33kWh went into heating. Also the wood stove was on for about 5 hours and consumed around 8kg of wood during that time, which is an additional 38kWh of heat. That would be around 15kWh of electricity at COP 2,5, the total would have been 48kWh of electricity, which is I think not bad. It shows that the external wall insulation is quite effective. Gas usage in the past before insulation and new windows was around 40.000 kWh a year! It turned out that the lowest efficiency was rather on a couple of days around 0°C but with a very high humidity, which made my external units defrost almost every hour, one time failed and I had to turn the AC to cooling for about 15 minutes to get a successful defrost. When it got colder and humidity lower they worked better again.

Very good, your average works out at approx 2.2kw/HR. Imagine an installer like me giving you a 2kw fan heater and telling you to heat your whole house and water, you'd call me mad and send me on my way. Love putting these heat pumps into context for customers 😅

I have been "courted" by the Octopus Energy heat pump team but I just cannot see it ever costing in. My energy costs in the Winter are a combined £20/day, we are fully double glazed and insulated but it's a big old solid brick house. If I went for heat pump it would be even more expensive because of the price differential between Gas and Electricity, despite heat-pump efficiency. But I am pleased for you if it is working in your case. 😀

We had a run of about 8 days where night time temperatures of minus 7 or 8 centigrade. Daytime temps were around 3 or 4 degrees centigrade. Our Vaillant 5kW heat pump coped without a hitch and kept our house toasty warm. Room temperatures never fell below the set temperatures. Downstairs we set every room to 21 degrees. Upstairs the bedroom is on 19 degrees (because we like it a bit cooler) but the bathrooms are set to 23 degrees. Never had a problem at any time. We have underfloor heating up and down stairs and we run it 24/7. Bill for the week on Octopus Go was just over £43 for the seven days COP was just under 2,9 We do have a very well insulated house.

Great video. Get yourself one of the vaillant smart adapters so you can control it with an app. I have the sensoNET which logs all the energy usage/output from the heat pump and displays the data in the app

Thank you very much Tom. All very interesting stuff. Apologies if you’ve covered this in previous videos but could I ask a couple of questions: 1. Are you maintaining a fixed set temperature 24/7, or using a programmable thermostat to vary the temperature at different times of the day and night? 2. What’s the max heat output from your heat pump? I appreciate it will vary slightly depending on outside temperature but what’s the manufacturer’s rating?

Nice video Tom. One thing I would look at is the average air temperature around you heat pump when its working this hard. Its quite closed in and maybe when its working hard you get a "cold well" effect around it. Possible future works would be to improve ventilation around the HP to allow the cold air to escape rather that sit in the well.

We have had a heat pump and solar panels for about 12 months and our electricity usage was 1500kwh more per year than the previous year.So the heat pump/solar cost about £500 more in electric but saved about 2 tanks of heating oil @ about £1000.

In your house is only 18.5 which is quite cold. I would keep the rooms temperature at least 20.5 degrees.

Not as cold during the daytime in that same week two nights of -6. Cannot break down what the heat pump used our highest usage for 24 hours on 17/01/24 for the whole house was 41.5Kwh. We do have 20Kwhs of batteries charged at 7.5p overnight on Octopus Go and used 9Kwhs of peak rate electricity and had some solar generation. Estimated total for the day £5.40.

Great stats on usage, can I ask what was original heat loss calculations on your home and kw heat pump size if you don't mind thanks Donal

Thank you for posting this Tom, can I ask what your flow temperature sits at, presumably it modulates up and down a bit with demand & flow rate ? I have an installation starting hopefully in a couple of weeks, system designed around 45C flow @ -3.5C (NE Scotland coastal).

Interesting video with lots of useful information and glad to hear you were nice and warm, apart from the back door mishap.😅 I think it's a bit unfair to compare costs of a smart electric tariff against a standard gas tariff though. For transparency, you should compare against a gas tracker, which is (has been) significantly cheaper then the price cap.

And I thought our elec consumption has high at 38 kWh on the coldest day in January where the COP dropped to 2.8. Daikin 7kW, space heating only.

Thanks for sharing this, i have found similar results altho in devon not as cold but still minus for several days. So far my heating COP hasnt dropped below 3. When you consider these sort of temp days are minimal, maybe 15? then for the othet 350 days of the year youll be quids in..

Hi man ur data good but I think u need to consider sun as you get solar gain and u also need to consider wind. Wind kills the heat in the house. If u consider these things you can get more accurate data. If found wind was chilling our house as we had down lighters that were draft so we replaced then and we now notice drafts come down conduit to switch’s in our walls. We need to seal them next. I.e. tape up the top of the conduit in the roof space. Great video thank you for posting

Does your hot water cylinder have an immersion heater? To use with a solar diverter

Hmm. This is about what i expected, but the sheer volume of power - thinking about everyone having one of these plus an electric vehicle over a week of cold snap. Less crucial if all the vehicles have v2h and a home battery, so it offsets some or all of the grid draw but until they are cheap enough to be in place in very large numbers, 3kw per hour to every house for 18hrs is a LOT to deliver over a whole town. Over the rest of the year itll be totally manageable. But those deep winter weeks... Hmm. Still: in terms of proving a heat pump works at cold temps and keeps you warm, job pretty well done. My house uses 80kwh/day at -3, running at 60c, and i will get a slightly worse cop than you as a result, which probqbly means a similar kwh consumption. So thats been helpful on a personal level thanks!

I'm in Colorado and in our cold snap, it dropped as low as -23C. We have a new 14 kW ASHP in a 20 year old house. We set it at 21C in the day and 19C at night. Over 5 days, it used 521.5 kWh, about $78, just heat, no hot water. Gas would have been maybe $90. I don't have any COP data but specs say the minimum is 1.9 and it had to be close to that. I know we could probably survive with the house at 19C but I don't want to find out.

Tom. Great vid. Is your house large or leaky (or both). Trying to understand why you need 100+kw of heat in a single day to keep it at just 19C?

Hey Tom. Do you use or have you considered the Homely programmer? It's been featured on Heat Geek. Works alongside smart tariffs like Agile. Curious to know how it performs.

Useful to know that the COP at those sort of temperatures is nowhere close to the usual assumptions of 3-4 which skews things a little but at the same time is offset by higher COPs when the outside temp rises - I’m starting to see it like MPG where it can be high on longer journeys i.e. proportionally more days when the COP is high versus short journeys with poor MPG or COP on the few days of the year when you’re ending up with less efficiency - overall it will balance out with COP vs heat delivered 🤔

I was curious about the usage of heatpumps in winter time. Compared to 10£ on jan 15th i paid 2.6£ for gas in 3 bedroom house temperature sitting at 24°C. At least i know i will stay with gas.

Yeah, its one of those double whammies with heat pumps. Their job is to heat your home, a task which becomes harder and more expensive the colder it gets. My house is quite large (Madrid, Spain) and we have a pair of Hitachi Yutaki's to take care of it. During a winter storm in 2021 (Filomena) we were going through 100kWh a day, the worst day being about 110kWh when overnight temperatures dropped to about minus 10C. Fortunately the exterior units kept themselves ice free really well BUT you have to remember that those de-icing cycles mean your heat pump is not heating your home in those moments. An important investement is good insulation and glazing - something that is essential if you are to keep the subtle and slow delivered heat from your heat pump inside your home!

Now try it in really cold weather. I’m in the US, and your temps are downright balmy compared with my area . I’d like to see how it would work when the outside temperature is at -20F for a high and -35F for a low with the high for the week never above -12F. They might be the cats meow for efficiency in your area but would fail miserably in mine. At least my opinion. My grandparents had a heat pump and at its best when the temperature was below 25F it would keep the house from freezing but not much more, it was an old unit and the new ones are supposed to be better. But I’m skeptical

Excellent video ! It would help to know a bit more about your house plus number of occupants, etc, so making a comparison with our own houses. Predictably, the high power consumption associated with frosty weather makes a battery system on a nighttime tariff easier to justify ? So payback will be quicker … I’m seriously thinking of batteries to power my heat-pump & all appliances. Any thoughts ? DavidC

What size heat pump do you have, mine is 8kw, i find on cold weather it constantly switches to short cycle when the heating is off, is this something that your heat pump does?

As the cold days are rare but disproportionately expensive . What's your thoughts on popping on your Christmas jumper and turn the target down to 17? I suspect consumption would be significantly less. Not the way you want to live all the time but for a few days a year?

Hello Tom, could you please supply some details to put your video into context with what your heat pump can and cannot do? 1/ is your heatpump classified as a cold climate heatpump (able to operate down to -30c)? 2/ did you do a heat loss calculation on your home to determine the btu or kwhr required by the home at a range of temperatures- particularly in the range of +15 to -15c? 3/ is your heatpump an air to air or air to water? (Because you’re comparing operating costs to your boiler)? 4/ was your heatpump sized for the heating load or the cooling load of your house? 5/ what is the kw output rating of your boiler? Is the boiler configured for outdoor reset? What is the turndown ratio of the boiler? Based on this video, on Monday the outdoor temperature had dropped to -3c overnight resulting in an indoor temperature of 18c with a setpoint of 19c. As an HVAC specialist, this indicates to me that the heatpump was sized for the cooling load and therefore extremely undersized for the heating load, but I await your response to my questions.

@TomBray-LowCarbonLifestyle - great vid. Would you be able to work out the difference between the running cost of a geothermal unit and your a2w unit? The geo unit would have a constant feed of 12° from the ground and about the same COP as your unit when it's 12° outside. I would love to finally figure out the total cost of ownership after 10 and 20 years for both systems.

Hi Tom, Pre heat pump were you putting similar ammounts of heat into the house? I have what Id think to be a similar house (presumed) victorian terrace, far enough north than our tempretures last week were only maybe a degree nicer than yours, windows done within the last 20 years, small probably 90s extension, only place where we may have a little more insulation than you is via an attic conversion (its got some insulation but its not amazing). Adult couple, no kids. Currently on a gas combi boiler but thinking about a heat pump once that gets a little closer to end of life. Hence the interest in your videos. Acording to the octopus app getting data from my smart meter the highest our gas use got was 40kWh per day (including a gas hob, but i cant reliably remember how much if at all that was used on each day). Even if we pretend none of that was cooking and my boiler is 100% efficent your still putting three times as much heat into the house as i am. Is that a normal ammount of heat energy? are we unusually stingy with the thermostat?

The problem is that you need to have the heat pump on during the day especially if you are at home all day. In my case it comes on at 5am and goes off at 11pm. Full rate for the electricity applies over most of that period. If you have cheaper electricity at night you are going to pay more during the day and that will be for other electrical items too. That means that cheap electricity is not always very helpful. I have a GSHP so my COP never goes below 2.9 and is usually around 3.5 even in fairly cold weather.

I wonder if it would be cheaper on the -3*C day to use a gas fire? I think they're only 70% efficient though

Interesting data, did you use the same amount of hot water each day and when was it generated as this would have a big impact on efficiency

Hi Tom great video. Would love to know your sq metre of your house as we live in a 200 sqm 220 year old stone house and we use roughly the same keeping the house at 20. We do live nr Peterborough so maybe day time was a bit warmer

my trust is so high while ive installed a heat pump i left in my old furnace which i maintain so it can be turn on when required

Was the desired temperature achieved at any point?

My heat pump didn't work under 38 ° and heat strip is nonfunctioning. Used electric heaters and fireplace. Got to start a go fund me to pay next month's bill😂

QOD: what type brand heat pump do you have? The specs on my new pump say that I should have no drop in efficiency until 10F. (-12 c)

I have the same heat pump, and we used 27kWh of electricity (solar and off peak battery storage) and generated 100kwhr of heat at -6oC in oir 4 bed detached. Question, Is your heat pump in an optimum location for air flow and circulation, Tom?

Really interesting article, thank you. My wife would agree (18.5° - “that’s cool” 🙄). If it (temperature) doesn’t start with a 2 then throw another log on … Sorry, I know the tech is good (but not for me). (But don’t get too frustrated - I’ll keep driving my ev knowing that 80% of the year it’s powered by our solar panels.)

Can you get the temperature higher than that? I am a chilly mortal and run my heating well in the 20s and am concerned that no matter what you do you cannot get the temp up. I have had this with air con driven heating systems.

Interesting and reassuring as we are having our heat pump installed in a few weeks all being well. Although wearing a t-shirt indoors was reassuring, we tend to wear warmer clothes and turn the thermostat down. Question: clearly turning the thermostat down reduces heat losses and the heat required to heat a home. However would it also increase the COP as well?

Look into octopus tracker tarrif, ive consistently paid less than 18p per kwh and gas less than 4p On the 19th i used 96kwh of gas and paid £3.65 for heating and hot water

I would love to know how well insulated your house is compared to a 1930’s built house and what cost that was to get the insulation up to the standards you require (is there a link for that?). I’m also surprised that you only run at 19 degrees and not at 20 or 21 degrees which would be more the national average

My utility bill this month is around £600. - it’s a four bed detached. I have the loft insulated and the cavity walls plus double glazing. I have no idea how people can spend so Little on gas and electric. It’s cheaper in summer of course but still. I can only think people run their homes at just about the governments minimum recommended temp. Sorry , I haven’t worked for 40 years to be cold in my retirement.

Under the Microgeneration Certification Scheme (MCS) a heat pump should be designed to heat a property to 21 degrees at an outside temperature of -3 degrees, yours can barely get to 19 degrees, it would appear the heat pump or the system could be undersized. You should have been given the expected SCOP with the quote and you would reasonably expect around 4 to 4.5. Maybe the heat pump is undersized for the property and insulation levels.

Is your home heated by underfloor heating or radiators. I was told there is a big difference

Thanks for the video. For Joe Public I think cost is the biggest thing. How much and can they install a heat pump in their property when it comes to replacing their gas boiler. How much is the government willing to subsidise this is going to be massive in persuading the public to install in the next decade. For most they are not concerned about how much CO2 they are not releasing compared to be gas boiler but just that they want to keep warm in winter and how much it costs them.

Yeah, cold snap is expensive .. I had over a couple days -14°C and the COP went to 2,39 with a total energy usage of 61 kwh. I wish I had your prices though as one kwh here costs 35 Cents. By the way my target temperatur in the house is 22 °C :)

The outlay is a bummer. Many years to pay that back 🤔

Do you find those interior temperatures comfortable?

2.5kw/h is a lot for a heat pump. Probably the heating element is on? Even 5kw airconditioning units use about 1.5kw/h. Even my gas boiler will run at about 45% power when it's on until it reaches 65 degrees. Forced mine to 8kw now.

Just as well that the uk never gets particularly cold....

You have your temperature set at 19C, how would it cope with setting it at the 23C that my elderly parents like their house heating set at during a similar cold snap.. can it even reach that temperature?

Imagine if and when we have only heat pumps add electric car battery chargers, how will theElectric power source be provided and what if there are power cuts for one reason or another. I think UK will have a very cold and rude awakening,! 😮

I do feel sorry for anyone who was prodded into a heatpump, only for the companies to reveal they are now using propane and better gasses. I also hate to break this to you as well but I have aMVHR and the gas heating has used about 3.5 quids worth maximum, 44kwh with all the hot water. I try to keep the temperature comfortable 21 to 23 degrees. The solar has been a bit pants, the battery has only managed about a 3kwh charge, only a small 3kw array, but it obviously is no where near the 50kwh (100?) needed to bump up a heat pump. You look like you have a fair bit of land there, farmers are reporting cop of 6 from there ground source pumps. Anyway thanks for the in site.

I can tell you that my wife wouldn't accept 17 Deg ! Our oil boiler gets us up to 22 and she's just about functioning.Lol.

I'm using a mini split Heat Pump to heat my home so far 28 days of heating I've used 108 kwh in total and has cost me approx £9.69 In electric

Why is your room sensor standing on the table? It should be fitted on a wall, centrally in the house, 1.5 meters off the floor, away from rads, direct sun light and draughts.. also, 19C target temp is quite low.. in my house we set it for 21 in the morning and 20 in the late afternoon.. with a set back temp of 15

Surely the fairer comparison is gas and electric tracker prices, certainly not a ToU v cap

I still find it amazing how a heat pump can get more than 100% efficiency. Its like getting energy for free.

Really! All this trouble just use a gas boiler 7p a kWh.

Hi Tom, I have a zero-emission (and very effiicient) Bed and Breakfast down here in the lovely Ancient town of Rye, in East Sussex. I'd very much like to invite you (and family) down for a night for you to review, comment, critique and discuss going from a regular domestic user to "light commercial", with a 34 panel solar array, a 12kw ASHP, 10x Air to Air heat pumps, underfloor and heated skirting boards....oh, and 4x 7kw EV chargers to boot :-) I hope you catch this comment :-) All the best, Javed Khan, Magnolia House Rye

One = obviously if electricity goes up then bigger bills , two = would you think air to air would be a better solution, still have a heat pump just for water , this is what I’m thinking of doing what’s your thoughts ?

The carbon emissions of the grid is higher in winter as more gas turbines are burning gas. You, like everyone uses “annual average carbon emissions “ to show that heat pumps create less carbon. I like heat pumps but I think we need to change this calculation, and I’m planning to look at it. Thanks for good video.