I'd echo the Mixergy and also look at a sunamp heat battery, ideal for this situation and can be used with either solar PV or solar thermal in the future. Electric underfloor heating is fine to take the cool off, but there are much much more economical ways to heat a space. An air to air heat pump (what everyone else calls AC) will give about 5 units of heat for 1 unit in out, and will keep you cool in the summer too. Hope that helps!

Only a few thoughts: - I think the corridors are internal with no windows? Consider PIR lightbulbs or sensors so they turn on (and off automatically) - ref your worries about weight, could you put the HWC outside in a forkliftable insulated shed? You'd also save some space inside for a sink to wash up your paint brushes... - consider a kitchen hot water tank - no cold plumbing leg to draw off before getting hot water for washing up, and (more importantly) no wait for hot water for tea...

No recommendations for brand or anything, but if it was me I'd still keep the shower electric and separate from your unvented cylinder. We have a heat pump with an unvented cylinder and the big frustration is that we run out of hot water with consecutive showers. With a busy family like yours having an electric shower might make life a lot easier!

Great overview and catchup of your project, it looks amazing. A think that a single double socket for the girls bedrooms is nowhere enough once they start having proper homework to do . Desk lamp, laptop / tablet charger, phone, fairy lights etc. I would say 3 double sockets may be enough.

4:28 - Is that an electrician sweeping up? Well I never. 😊

When you plan out the gap in the units for the American fridge make sure you leave a gap of a couple of inches at the top for ventilation - they run pretty hot. Also worth running a water supply with an isolation valve to that point under the units if you get one with a plumbed water cooler/ice machine. The plumbed ones tend to have more useable space. Due to your sound issues, I’m not sure if you are planning a kitchen island in front of the units? If you are make sure you leave enough space to get the fridge into the gap!

Thank you.

Back boiler... But hear me out! The back boiler can be used in the winter and you can have your couple of immersion heaters running in the summer when the log burners not on! Done it in our caravan and container conversion and works a treat 👍

If your having solar look into getting a myenergi eddi it can hook up to a traditional hot water tank and use the immersion to heat the hot water using the excess solar during the day

You might want to look at a Gledhill PulsaCoil for heating your water. Open vented thermal store, with a heat exchanger for mains pressure hot water. I'm a DIYer and found the install incredibly easy.

Hi sir as a retired electrical contractor I would advocate splitting the two haves via two fuse boards , just for future ease of separation . The supply to the second unit could be via a 45/50 amp isolator . So enabling a permanent separation of your two units if required . Best wishes and kind regards as always

On the topic of hot water we learnt the following on our granny annexe: the Stiebel Eltron DHC-E inline water heater (available at toolstation at a good price) can take an incoming water temperature of upto 55degC. So we have this plumped downstream of a hotwater cyclinder (which granted is heated by a heat pump), to ensure the shower never runs out of hotwater. As the cyclinder temp drops the inline heater kicks in to give full temp. And you can get fairly high flows when the tank is at 20-30C. So you can easily get 6 people showering back to back in a rainfall shower on a 200L cyclinder heated to 48C without any noticeable change it water temp. No reason to think the same on a smaller

Just moved to Japan and am starting to fix up a house here. The house has an oil fired boiler for hot water and used LPG for cooking. We put in an induction hob for cooking and are soon replacing the hot water heater with an electric EcoCute heat exchanger for hot water. Good for Japanese baths which are usually very hot.

projects coming on well, as for a boiler for the bath, I was in Gran Canaria and they had a small electric boiler for flat hot water covering the bath and mixer shower and utilities area it worked very well and heated up fast aniston was the make

Probably too late now but smoke alarms usually go on lighting circuit so (if anyone else stays there) they can't be turned off without losing lighting. Also, back boiler on wood stove, even a small one, combined with vented tank with immersion heaters (one solar/air source, one mains 3kw) gives you summer and winter options. If fire isn't lit, electric kicks in. Very old school but very simple and cheap for temporary. Insulating under and around a bath keeps it warmer for longer. Electric underfloor is generally just a 'tile warmer' whereas a wet system will make the room feel warm. Both systems are radiant rather than convection, so very efficient and don't warm air. With underfloor on a timer, it will provide enough until you've got up and lit the fire.

Hi Tim and the family, im loving the build plus the farm updates. I would recommend for your hot water conundrum is that you look into the OSO Indirect Hot Water Cylinder SUPER COIL - SC, im a plumbing and heating engineer and ive been installing these in rural cottages without gas options and very limited space and i couldn't fault them plus it has a coil if you decide to do solar.

Take a look at the Mixergy hot water tank. Heat what water you need, works with a range of sources, so can use an immersion heater for now and solar thermal in future. Different sizes, so may find room in your utility room. Combine with an off peak tariff, and only heat the whole thing when you want a bath. If it needs to be smaller a Sunamp could be an option, uses phase change material rather than water for heat storage.

Water heating sounds sensible on the hot water cylinder with 2 elements. I would consider not having an electric shower though and using the cylinder for shower too(maybe increase the capacity!) you can possibly connect to a decent tariff for perhaps one or both of the elements and heat the water during cheaper periods. If you have an electric shower you will pretty much only ever use it during peak times. Plus a shower from an unvented cylinder is a far nicer experience than electric. I am an electrician and this is the sort of set up I recommend when we’re doing electric only heating jobs!

Kitchen: boiling tap massive massive game changer :)

You could look at a hot water tank dedicated heat pump... Or look at SunAmp or Mixergy, both are more efficient

You should have looked at installing micro controllers in the light sockets, and wireless switches you just stick on the walls when they’re finished. Much simpler to wire up, and easy to reposition switches later.

Hi, we live in an flat that does not have a gas and have installed a Gabberon electric combi boiler that is modulating and can be set from 9 to 15 Kw and easily copes with both baths , showers and central heating if required. it contains small built in header tanks and a pump. It has been installed for several years and has given no trouble whatsoever, remember this also does not need a flue or pilot light. I also have a brand new 62 amp blue plug and socket going free to you if you can use it.

If you've got 3 phase power coming in you might be able to use a electric instantaneous water heater for the bath.

When it comes to kitchen units you must look at DIY kitchens , they are great value, very good quality and fits with your DIY ethos.

I would suggest DIY Kitchens - good online planner (with 3D rendoring), it builds your shopping list as you build your plan, staff check your order and advise if you have missed anything, great range, good quality and a great price. I saved around £9k on high st quotes and delighted with final result. Would recommend you take a look at them.

You should have a look at Mixergy for your cylinder options, solar coil, air source and std boiler options available and slim or std sizes. Only had mine for a month but it’s great, only heat what’s needed, learns usage patterns to try and ensure you always have hot water. Definitely recommend.

Mixergy! It’s all I have at the minute and works great!

Solar panels and a myenergi eddy gives me free hot water for at least 6 months a year. Might be worth considering 🤔

We are in an all electric (Economy 7) house, which we refurbed 5 years ago. The Glenhill unvented cylinder (160 litre) has been very good. The only problem has been that the expansion tank failed this year, but as its separate its easy (and cheap) to replace. I’m just in the process of installing solar pv panels this month, with a “solar diverter” to divert any “unused” solar electricity into the immersion heaters. Its maybe not the most cutting edge solution, but its substantially cheaper than some of the thermal store type options

And as always, edited because you covered all my thoughts.... Are you planning on a MVHR? would be worth it if you could run it in the ceiling, to minimise heating costs and make most use of the warmth from wood burner. a) If you're free to spec the wood burner and have the space I'd go with a back boiler and tank? and use that for the hot... but then you're limited on when you will have hot water. b) Potentially instant hot/ boiling water taps cover kitchen and bathroom hot water, not sure about bath. c) Look at Mixergy tanks.

Hi Tim & Jo, You were talking about using 4 x double sockets for a "charging station area". Not especially pretty, even without the maze of wires. The wife vapes and always has batteries in to charge, I use a 6-port USB hub plugged into a single 13A socket. They ( Anker ) do a 10-port USB hub for £60 which is so much better than a line of wall-warts!! You can keep a couple of double sockets for laptops or monitors if you might use it as an editing station, now you don't have your old converted loft!! I follow another YT'er who is trying to move wholly electric ( EV Puzzle ) and he has tried integrating the Mixergy tank with good hot water results, but mixed integration with his Home Automation set-up - he is a stats man!! Also @The Fully Charged Show has done some videos on the Mixergy. Robert ( Scrapyard Challenge ) Llewellyn was one of the early adopters and has had his for a few years now with more recent reviews and chats with the company. Great content as always!!👍🏻👍🏻

Re the hot water, definitely dual immersion heater with solar coil. If you intend to have PV with no battery storage, it can be used to heat the water. With battery storage any energy exported can also be directed to heat the water after batteries are full. Either way go for some sort of hybrid inverter. Solar thermal is relatively cheap, and more efficient than PV at turning the sun's energy into heat, though a solar dump may be necessary as your water temp can easily exceed 65 Deg C. Also, go for the largest cylinder you can fit, 100 litres sounds a bit small especially with growing kids. I got my cylinder from Newark Cylinders and can custom fit them for your requirements, with extra hot water outlets etc.

Tim great run through, solar panels are great, and you can get an Iboost that pushes power to an emersion which can heat the water in a tank.👍🙂

Best thing I did was put an electric shower outside fed from the hose pipe, no more muddy bathroom from the dog. With how muddy your dog gets I would definitely consider it.

Your kitchen explanation was very Ryan and Hugh deadpool 3 plot…… 😂 Re hot water. Really interesting dilemma. For me. Bin the bath. Our children were very young and we had a main bathroom refurbishment which went wrong. Took ages. The kids used on suite shower. 2 and 4 at the time. Never bathed since. The dog, old butler sink in the yard works well.

Tim, if as you said you'll have solar array, I would consider Sunamp storage for the hot water. More expensive than traditional tank, but the losses are reduced and the size is halved.

Love the channel and the project! I assume you've planned some kitchen layouts by now, but you appeared to fill in too many 600mm unit sections along that internal wall to then fit in a hob on the outer wall that wasn't ending up under the window? maybe it was just the camera angle, but with American fridge freezer larder/larder double oven then microwave/coffee machine? (that end section seems sub 600mm?? but with cabs coming out 600 that then puts you standing hard up beside the oven to be at the hob? as it looks not much more than 1200mm to the window? hope that makes sense. But wish you nothing but Luck and success with it !!

120 litres is tiny, go for 200, with a house full of people you can run the showers off it too, then you won’t need inefficient electric showers in the bathrooms.

Any public baths in your area?🤣

An Electrical Engineers set tips: I would add PV and battery storage now and don’t wait until later ( if you have the money obviously) a 4kw unit could cover peak usage and at current energy prices you can get a far quicker payback. Don’t wait…… Put in RCBO circuits as opposed to an MCB circuit with a master RCBO. Its not a massive up lift in costs to do this but worth it ( might be a little late for that now as the sparks have been in) Put a surge suppression unit adjacent to the incoming supply. Circa £100 but if it’s your business it might be worth it. Buy dimmable lighting and dimmer switch modules. Especially in the bathrooms and for night time in corridors. Have a separate circuit for the common areas and another for the bedrooms so if one trips you have lighting you can find your way around. USB sockets in the office Not for here but allow a 32Amp armoured supply to the front of your house for a future car charging point. Same for a loft conversation, and garage. Anyone else have a few more???

Tim - there are 6 or you + dog and lots of electrical wquipment . . . I think most of the time you will produce enough heat without needing radiators or underfloor heating but you have said in the past the family likes to be hot. If it were possible for the log burner to pre-heat the hot water that would reduce your electricity bill . . . brownie points for lots of hot baths quickly?

Definitely just the unvented cylinder and a conventional shower. Cylinders with internal expansion are a great option for saving space. DIY kitchens are good for the kitchen units

Hot water, my suggestion would be down the Unvented Cylinder route. Immersion element takes care of it for now. Buy an solar coil one and you’ve got the option to add solar thermal or a gas boiler in future without replacing the cylinder.

Don’t ask us for advice. We have silly ideas. Love your work 👍

Not sure if this has already been suggested, but take a look at a sunamp thermal battery, perfect with PV. will save space compared with a cylinder.

I wouldn't even consider emersion heaters unless your looking to pull off the grid and going to go with battery storage. I'd consider gas or oil If your having a wood burner or an aga type oven consider ones with back boikers and ones you can run on a solid fuel

Look into an Air source heat pump. We install them to heat our clients swimming pools.

Hang on I saw a sparky using a broom 😂😂😂

I’m sure you’ve considered this but could you not supply hot water into the cabin from outside via some sort of connector? We’ve got an external oil boiler and love it. Quiet and no smell in the house and I know they do combi versions too or of course gas if thats an option. Alternatively could you build a small boiler shed without needing planning or use one of the existing buildings? I’d be tempted to house the washer and dryer separately too given the noise they make but that may not be an option. Good luck with whatever you choose, love the channel!

We installed a full height pull out larder unit in our kitchen. It was rubbish, things fall through the gaps in the wire baskets, and it's got limited flexibility with number of racks and positions. It couldn't cope with too much weight either, e.g. too many tins and jars. I replaced it with shelves inside the cupboard. It now has much more storage and would have been much cheaper if I'd done that originally. If you're dead set on a pull out larder, I'll sell you my old one for a good price 😉.

Also get use gas hob on 47kg bottles. So cheap, lasts me whole year one bottle. I got 90cm rangemaster used on facebook for £100. Nothing better cooking with gas hob. You do need a 6mm cable on dedicated 32a circuit.

Given the build and the need for flexibility the Sunamp type thermal storage would be a good option. There are a number of brands on the market and the plumbing is simple and if you go solar you can use directly to storage or overnight main rate. They are no heavier than a tank once it is full so it would only be on moving hodgepodge that you would notice the difference

Add a recoheat pumped air heat recovery to your wood burner flu-have a look at youtube videos-this will add positive air pressure to the building and drive out the moisture as it adds in more heat and fresh air. Great build and vids thanks

Daikin make heat pump based hot water systems for shower/taps, which can also incorporate solar thermal. 2-3 times less power use (running cost) for the same heat as a resistive heater. Over a few years of use, it might make a lot of sense. I'm sure other companies make them too.

I Have 100L unvented HW tank (replaced the Power shower) its been great.. even better with Solar. Does not last long enough for a 30 minutes shower (the OH takes) but its enough for a bath and my 7 minute shower :) We will perhaps add a second 100L tank. - this is a 6 bed 4 bath house BTW!

Are you able to show a floor plan at some point soon?

Safety Glasses while you're using the nail gun. Set an example Tim.

All electric in my house and have just fitted a Mixergy tank it heats water form the top of the tank and only heats what you need.

Are you looking to fit the wood burner soon with the weather now turning? It would make working in there a lot more pleasant as it turns colder and no shortage of fuel on the farm 🔥

Valliet auro therm plus, air source heat pump is so good and has saved me so much money on electricity and heats water very cheaply. If adding solar it would be free to run. My two bed house is a 3.5kw one. Done video on my channel.

Is it a film? A book?

Are you going for heat recovery extractor fans?

Have you thought about a small Hydro system? Given you have a river on site. Kris Harbour Natural Building does micro Hydro systems that might fit the bill. Possible KZfaq Colab? 😁

do not lose the idea of elec shower because you have an emersion. In summer and washing five bodies you'll be using showers 99% of the time.

An interesting and informative video as usual. Looking ahead, I was wondering about your plans for managing waste water. Assuming you are not on mains drainage, will you be installing a septic tank or a package treatment plant designed to discharge to a watercourse?

Tim, if possible and within budget use 3 phase. Because it will allow you to have a electric combi big enough to allow a bath or it could be a system boiler with a cylinder maybe. Look at EHC boilers.

Just get a cylinder which has a primary coil for a heat pump. Job done.

I like it at 4:40ish, your "house" held together with a quick clamp thingy 👍. Were you not tempted to run some of the cables yourself. Build is looking great.

It’s a film 🎥 Up high , no outside, no down here 🤷🏼‍♂️ Aww I give up, what was it ?

If going with a tank look at Valiant arostor, cylinder with heat pump above. If going cheaper would just do tank with 2 immersions, 1 connected to iboost, and don’t bother with solar thermal just increase pv to immersion. Or if your short on space and can wait for bath to fill just fill it with electric shower over bath!

Hob Extractors. I have been told (during my research for my kitchen re-layout), that you can get Cartridges for most Extractor hoods. For me this will be ideal, as my Hob will be in an island, and routing the Duct work was proving to be an issue. Might be something worth considering for you rather than cutting through your beautifully engineers walls..

Have you looked into a mixergy tank? I know Bobby Lew uses one for his home which runs on just electric.

Soar and a Myenergi Eddie for the water

Hi, loved the video and I have a question. Why do you need a tumble dryer? A simple covered lean-to with a washing line under it would do the job for no running cost. It would also dry in most weathers, a hard frost would be the exception but how often do you get a hard frost during the day? During those days a heat recovery unit in the utility room would get rid of all the damp air from drying the washing on an internal line. Just a thought. As always thanks for posting

Just a quick idea, as you are on a farm, what about a bolt on wet room/porch over your front door.

What about adding an annexe on the side with just a cylinder in it that way you can have a larger cylinder as you need. You can also disconnect it and transport it separately if it's moved. Solar panels could also directly heat your water

Be aware that if the hob is too close to the oven then you won’t be able to open the oven door if someone is at the hob, plus it could be quite dangerous

You said you have a wc but not going to have a hand basin in the utility room. Thought code was you had to have a basin where theres a toilet?

Under sink water heaters don’t last very long. If you buy a sizeable wood burner you can put converted fans on the top to distribute air. Saves on a low wattage fan they work great I’ve got one for mine. Pressurise water system would be better for the whole house with two Emersion heaters. Cheaper maintenance and cheaper installation costs for under sink heaters. Get a good cylinder it will carry a 25 year guarantee against corrosion.

“She wants a bath”. I fitted a beautiful shell resin stone bath in our house because SWMBO (She who must be obeyed) wanted one. That was about 10 years ago and she hasn’t been in it once ! Happily our daughter, who has moved back in with us, uses it, so not completely pointless effort and expense. My advice would be to say to your SWBMO “ No. Baths are relat😂ively unhygienic - who in their right mind wants to stew in their own bodily fluids - , very energy and water hungry and impractical in the ‘caravan’. Showers are a much better and far, far more sensible option. Live with it .. it’s only temporary for goodness sake”. Be prepared for ‘stoppage of benefits’ and the silent treatment for a short period - STAY STRONG !!😊. Wash the dog in a shed - and SWMBO too if she still insists on a ‘bath’. But ensure you’ve got a long hose and a wet suit. Good Luck!

Have you looked at the Fischer Aquafficient - Instant Hot Water

Have you considered a open vented mains pressure cylinder like a pulsacoil? I have used a couple in renovations where a bath has been a request.

Is there any accommodation made for a secondary egress back in the bedroom area? Safety issue.

Any electric heater that uses an element to generate heat can only be 100% efficient, i.e. 1kw of electric in = 1kw of heat out, any sales blurb claiming increased efficiency over other forms of electrical heaters is basically rubbish An air/water heat pump is probably too costly for this project but a split air con unit (air to air heat pumps) would be 3-5x more efficient at generating heat than electric heaters, so 1kw electric in will give 3-5kw of heat out depending on outside temperatures, plus they'll cool it down in the summer. You can get multi splits that run 2 or 3 indoor units off a single heat exchanger outside, so maybe one on each side of the building so the connections don't need to be broken when the cabin is split in half.

Tim it would be interesting to see how much AIR TIGHT the caravan is !

Tim I’ve been watching all these videos has been a great help as I’m going to start my own build in the new year not as big as yours just a single unit, if you don’t mind me asking what’s this going to cost you roughly thanks Jamie

How often are you likely to use the bath? If you are only going to use the bath for the dog and the odd soak, it might be worth keeping the electric shower for every day alongside a hot water cylinder for that occasional bath.

On-demand water heater - electric is unknown but it would handle all the water needs.

Sunamp heat battery. It's what I'm looking at with a heart pump as I don't want a water cylinder.

Small solar preheater, maybe? Electric heat pump water heater not cheapest to buy, but cheapest to run.

Question: are you smart homing the whole thing?

Tim couple of eco fans on top of log burner but not cheap ones(£80ish)👍👍🍺🍺

Hi love the channel very inspiring 👌🏻, just an idea if you are having a solar array for the cabin, you could get a product called solar iboost. Basically any spare watts (think as little as 150w, maybe less) will go to your immersion heater giving you fee hot water 👍🏻. Have just bought one for my solar install, a friend has it and raves about it, just a thought. All the best Dan.

No sink in the utility?? where will you wash your paint brushes?

2 double sockets per bedroom may not be enough, i would suggest 4, after all you're just deleting extension leads in the long run. Get a simple solar pv array (second hand panels and second hand inverter), myenergi eddy and a hot water tank, as someone else says, free hot water for at least half the year when the sun shines. Also, i know it's not exactly a massive place but you might want to add some cat6 strategically, even if they don’t actually go to ethernet jacks and just terminate them in blank boxes.

Hey Tim, I don’t know if you have them in the UK, or if they are appropriate, but in Australia, we have Heat-pump hot water systems that use electricity but draw heat from the environment; this may be an option.

What about a back boiler wood burner?

you can tell they are on camera. they are tidy!! unlike 99.9999% of sparkies.

I know you will probably be out of the caravan(s) before it becomes a consideration, but for bathroom shower capacity you might consider the requirements of teenagers. (It was a surprise to us with one!).

Mixergy? Sunamp?