Mains pump on tank to feed combi
Posted: Sat Apr 02, 2022 7:09 pm
Hi
I currently have a 2bar shower pump pumping cold from my tank and hot from my cylinder to my shower. Now we're getting the house renovated, and one thing I'd like is to consider a combi boiler to save on storage.
I know I cannot use the shower pump with the combi boiler. However I'd like to maintain a decent head of water in the shower. Furthermore, the mains pressure is not ideal - I'm getting about 8 litres per minute from the mains to the kitchen sink (ground floor two storey house).
It was suggested to me that I use a mains pump on my attic tank (instead of on the mains) to feed the combi boiler. This would in theory give enough pressure to result in flow to the shower similar to what I have already. However, there are questions I have and am not sure how to answer them so looking for help here.
1. The tank in the attic is 50 gallon. Will putting a mains pump on the outlet of this run the risk of pumping it dry in no time? 50 gallons is quite a lot of water.
2. Would this result in too much pressure on the other hot water outlets (kitchen sink, bathroom sinks, bath tap) and result in drippy leaky taps (and a constant on-off of the pump as the pressure drops and it recognises that)?
3. How to choose what size mains pump? I see a 4bar pump - but 4bar seems quite a lot especially when the original shower pump was only 2bar
Any help appreciated!
I currently have a 2bar shower pump pumping cold from my tank and hot from my cylinder to my shower. Now we're getting the house renovated, and one thing I'd like is to consider a combi boiler to save on storage.
I know I cannot use the shower pump with the combi boiler. However I'd like to maintain a decent head of water in the shower. Furthermore, the mains pressure is not ideal - I'm getting about 8 litres per minute from the mains to the kitchen sink (ground floor two storey house).
It was suggested to me that I use a mains pump on my attic tank (instead of on the mains) to feed the combi boiler. This would in theory give enough pressure to result in flow to the shower similar to what I have already. However, there are questions I have and am not sure how to answer them so looking for help here.
1. The tank in the attic is 50 gallon. Will putting a mains pump on the outlet of this run the risk of pumping it dry in no time? 50 gallons is quite a lot of water.
2. Would this result in too much pressure on the other hot water outlets (kitchen sink, bathroom sinks, bath tap) and result in drippy leaky taps (and a constant on-off of the pump as the pressure drops and it recognises that)?
3. How to choose what size mains pump? I see a 4bar pump - but 4bar seems quite a lot especially when the original shower pump was only 2bar
Any help appreciated!