Can I run a combi boiler from a water tank?
Discussion
Mark300zx said:
I live in a first floor flat, the mains water pressure is falling and my combi is struggling to produce decent hot water shower pressure. But my water tank gives great pressure, so could I feed the how water from the tank to the combi and cold shower water from the mains?
I don't understand how your tank gives greater pressure than your mains - how does the mains water get up to the tank? Sounds like a flow rate rather than pressure problem- so if you feed the hot side of the shower from the tank and the cold side from the main then you won't be filling the tank and it'll drain down through the combi.OK, the reason I was asking is that my shower has less flow at the moment - not because the mains pressure is lower, but because (I assume) the mains temperature is lower and so you need to turn the flow rate down to heat it to the same temperature. Same with my combi because it is controlling to a fixed outlet temperature. Having higher water pressure doesn't necessarily help if you haven't got enough power to heat it - you might just end up turning it down more!
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