Recent content by Joe Hardy

Thanks to everyone who contributed - I am now better informed as to the way forward

Nigel F My hot water cylinder was replaced ten years ago - old one weeping I think there is a coil inside this tank and it's called a fortic or something? the external pipe connections/ pipework is 22mm - this cyiltol valve is imperial 1" - will I have to do some pipework mods to accept this...

I would like to have a safe acceptable solution which is why I posted in the first place - and I really appreciate your input here - what I need to understand is how the boiler internally works because in the scenario I have described CH + HW + boiling domestic water - the boiler will virtually...

Sorry jackthorn - misread your last post Fair point - yes the thermostat will allow power to the motor - I was hoping that the valve would be spring return such that once temperature dropped the power circuit would be broken and the valve would 'spring' back open - should it stay shut the...

Nige F If you can imagine that the flow pipework to my domestic water tank forms a 'T' such that the first leg of the tee is the flow from the boiler the second leg of the tee is into the hot water tank with the third leg rising above the domestic hot water tank and into the expansion tank I...

Nearly - when in HW only mode (and within the timed on period set in the programmer) the thermostat on the gas boiler itself starts the firing up of the boiler maintaining a set temperature in the gravity loop pipework to the hot water domestic cylinder and shuts the boiler down when the set...

The programmer allows hot water to be separately controlled from the central heating (normal operation for semi gravity systems of the 1970-1990 period) - in the summer we have CH off - HW only on a timed basis say 2 x 1 hour periods (we also have an electric emersion heater in the domestic...

Thanks for the reply jackthorn - Unfortunately No I agree but it's no problem adding the valve into the pipework in the loft - fully boarded out and easily accessible pipework around the hot water cylinder- I will be draining the system to replace an undersized radiator so thought I would solve...

During the severe winter when my CH is on permanently the gravity feed to my hot water tank causes the domestic hot water to become dangerously boiling hot. I believe I need to install a cylinder stat that operates a two way valve stopping the gravity flow into the hot water tank once the temp...