excellent,clear and simple,informative-highly recommed,most helpful.

Just looked at a different video the only difference was that he used the lower valve as a flow and the top as a return for the anti freeze. I reckon it realy makes no big difference it will work both ways . Thanks for the clear explanation. Just had to fill our system after 8 years the pressure had gone to zero . There where some connections on my system that had sweated over the years you could see the green and black build up on the connections . I guess the installer had not tightened it enough because I could tighten it a bit more . Just got a cheap water pump with a maximum out put of 3 ato and a plastic drum of anti freeze. It worked perfect the pump is silent again

What pressure should this system have reading on the clock when you close both filling taps

Ok felicităr

.... okey

Please don´t use automatic air vents on solar...