If the water level in the larger domestic storage cistern is higher than the smaller feed and expansion cistern and there is a leak within the cylinder indirect coil water will find its own level and the smaller cistern will overflow.
Should have said that its gravity HW system
Tony, you are, of course, correct again. The system is fully pumped, I'm new to this and getting details incorrect which doesn't help those trying to provide assistance.Should have said that its gravity HW system
No it is not!
Gravity HW in plumber's language means where the heating coil relies on gravity circulation from the boiler without a pump.
That only works with very old boilers having a cast iron heat exchanger.
Yours is a pumped system!
The question is whether its a converted direct cylinder or an indirect cylinder with its leaking heating coil.
Tony Glazier
If the water level in the larger domestic storage cistern is higher than the smaller feed and expansion cistern and there is a leak within the cylinder indirect coil water will find its own level and the smaller cistern will overflow.
Running a system with ds40 in it for a week?
I'm surprised you still have a system left ffs!
Primatic hot water cylinder?
the other tank which has been there for decades empties when i drain the HW system. i assumed that this one was only for the central heating
Is that what this is?If it was originally an electric heated cylinder then there would not normally have been a heating coil in the cylinder.
But they were convertible with a heating coil which screwed into the immersion heater thread. They were called something like a Micraversion.
They might still be available! Whilst most would always say a new cylinder is required then replacing a Micraversion would be a cheaper option to continue the past bodges on your system.
Tony
Yes. A header tank. As in one.Would the primatic have a header tank?
I fitted one in the 1970's. That one has been fitted with an Essex Flange leaving an immersion heater in the original boss . New tank timeYes, I haven't seen one of those in ages!
You can get a replacement from VA heating. Stoke on Trent .Is that what this is?If it was originally an electric heated cylinder then there would not normally have been a heating coil in the cylinder.
But they were convertible with a heating coil which screwed into the immersion heater thread. They were called something like a Micraversion.
They might still be available! Whilst most would always say a new cylinder is required then replacing a Micraversion would be a cheaper option to continue the past bodges on your system.
Tony
15m pipes
Strangely the tank also has an immersion heater fitted.
Steve
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