Is it ok to run dhw while the central heating is drained ?
thanks in advance
hal
Is it ok to run dhw while the central heating is drained ?
thanks in advance
hal
The combi won't fire up. It can be done by looping the heating F & returns together and then pressurisng, but impracticable for a temporary fix.
thats odd. water has stopped coming from the drain valve but the boiler still fires up for hot water ???
i have only run it for a few seconds so hopefully no damage done....
I believe they mostly have a water to water heat exchanger. The primary side is the CH water.
What is the shortest loop allowed ? I wondered why this is not done as standard, but I suppose it would required a few valves to change over from the normal CH to the loop. Simon.
If the boiler has a bypass circuit, then it can be as short as you like.
3 valves?
Check the boiler installation instructions. Sometimes a meter or two.
IME, installers are not looking to minimise disruption if something goes wrong. That's certainly something I did consider when DIYing my own (although I don't have a combi so this particuler feature is not relevant, but I can isolate and drain down sections of my heating whilst keeping the rest running).
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