Yes there is a check-valve but Im pretty sure it isnt 100 perfect. On cold mornings the house will feel cold as either the room thermostat or the.
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If its a combi or condensing boiler then no hot water or heating will be available until you switch it back on.
Will turning water off affect boiler. Well if you wont be using the water for some time and the water will only be off for a short time there is little to no risk involved. On a non combi boiler I would agree but as Op says its a combi with the main off there will be no hot water or cold and as the boiler cant try and heat a plate to plate without flow from the main I cant see a problem but Istand to be corrected. If the boiler is a sealed system then mains water being on or off makes no difference whatsoever as the system is re pressurised manually not automatically.
It should not be a problem. Boil a kettle and have a cup of tea you wont need to turn the filling loop back on as you havent. Actually while you are gone for a week an hydronic heating pipe bursting might not be quite as bad as a regular domestic water pipe bursting.
Your combi boiler would be the worst affected as the heat exchanger could suffer. Most people ask If my water heater is left on and the water supply is shut off will any damage occur to the gas fired water heater if very little of the hot water wont be used much or not at all. If you need to drain the hot water cylinder take a look at the how-to guide for this task.
My reason for also shutting off the boiler feed is to keep the boiler water from back feeding into the domestic due to pressure in the expansion tank. Is it safe to turn the water off at the stop cock. Now correct me if im wrong but surely as long as the hot water setting is turned off on the boiler the boiler should have two different heat exchangers so the hot water one would not melt due to not having any water to heat if it was off and the heating.
A way around this is to install or have installed a low water cut-off. In reality its not likely to cause any damage. Your boiler should have a cut-off switch so if for example a baseboard springs a leak then the pressure drop will turn off the boiler.
I shut off the house water main boiler feed whenever we go away for more than 24-hours even in the summer. Shutting off the main water supply valve to the house would have no effect on the operation of your hot water boiler. First if you have discovered a water leak whether in your boiler storage tanks or elsewhere turning off the water at the stop cock should be the first priority.
If a line in the heating system breaks he not only has no heat as the boiler can not keep up heating with an open break but he also has a flood. The answer was he can if he has a low water cutoff and some means of knowing that the heat is on. The safest thing to do before you go away is to turn off the water supply.
Would probably need a reset after but should fail safe. This obviously means that even if you turn off the cold supply the hot water cylinder will still be full of water. People worry that turning off the water supply will affect their boiler perhaps by overheating like boiling an empty kettle.
This control will shut off power to the burner if the water level drops. One may also ask should you turn water off when going away. If its an older system with header tank then maybe mains water should be left on as this is topped up automatically if.
Shutting off water Shutting off the water to the boiler can be a double edged sword. If boilers didnt come with a host of sensors and controls it might indeed damage your boiler if you turned it on with no water to heat up. When done just turn the water back on check for leaks where youve been working and if ok turn the combi back on.
Shutting off the main water supply valve to the house would have no effect on the operation of your hot water boiler. This is a safety precaution which prevents the immersion heaters or the boiler from trying to heat an empty cylinder. If your boiler is old enough to not have such a switch then turning off the water is probably a bad idea.
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