Cold tank, hot water pressure question

25 May 2007
Reaction score
United Kingdom
Hi, hope someone can answer my question...would having a larger size cold water tank help to increase the hot water pressure coming out from my hot water cylinder? ie is it the cold water pressure from the cold water tank what pushs the hot water out? or is the pressure determined by the hot water cylinder itself? Many thanks!
Sponsored Links
the pressure is determined by the the head of water from your tank to your cylinder e.g 1m=0.1 bar so if you have the cws tank 10m high it would be 1 bar. so the only way to increase your pressure is by raising the tank.
I see, thanks for your even if I increased the size of the tank which would hold more water say from a 4gal to a 24gal, it wouldn't make any difference to the pressure at all? This is because I can't raise the height as I'm only on a single floor. Thanks again!
Yep you got it. Try a bronze booster pump if you want extra pressure
Sponsored Links
Thanks Dave, but just one more question, would there any special requirement for the bronze booster pump? I mean would my cold water tank need to have a min capacity for the pump to work? thanks
I had assumed that you have at least a 25 gallon tank. A 4 gallon tank would only be enough for a heating f&e tank :rolleyes:

DIYnot Local

Staff member

If you need to find a tradesperson to get your job done, please try our local search below, or if you are doing it yourself you can find suppliers local to you.

Select the supplier or trade you require, enter your location to begin your search.

Are you a trade or supplier? You can create your listing free at DIYnot Local