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Hi All,
I am totally renovating my home i've just bought. We've ripped out al the plumbing plus had a new 25mm MPDE water main installed with good pressure.
We're doing a loft conversion so there will be a total of 3 floors with 2 bathrooms (1 on each upper level). I am trying to design the system to minimise flow rate/pressure drops when more that one outlet is in use (2 showers for example). The main premise being trying to avoid that dreaded shower fluctuation when an appliance or tap is in use.
So......
I was thinking of running a 22mm cold flow throughout the house T'ing of to 15mm for the various outlets, Keeping the 15mm runs as short as possible. The boiler supply will be closest to the stop cock so this should get fed 1st and should avoid the supply rate dropping to this i assume?
i am a bit stuck with the loft though. Should i run 22mm to the 1st floor, feed the 1st floor bathroom then continue up to the loft/2nd floor.
or....
is it worth running 2 separate 22mm flows, one to 1st floor bathroom, one to the 2nd?
My thinking is that if i do this then the loft supply shouldn't be interrupted by any use by the 1st floor. E.g. every room is running direct off mains pressure without interuption. Is my thinking correct?
I would also appreciate any thoughts on hoe to run the hot water. The issue there being it's a combi boiler, so only 1 15mm outlet to supply the whole house. So how to do i avoid drops there?
The boiler is 35kw and has a 14.5L flow rate. i have read that a 15mm pipe can only run max 8L/pm flow, so if i have 2 showers running and the boiler offers 14.5 per min, does it mean in effect the 2 showers would still be getting 7.25L/per min???
many thanks in advance
Carl
I am totally renovating my home i've just bought. We've ripped out al the plumbing plus had a new 25mm MPDE water main installed with good pressure.
We're doing a loft conversion so there will be a total of 3 floors with 2 bathrooms (1 on each upper level). I am trying to design the system to minimise flow rate/pressure drops when more that one outlet is in use (2 showers for example). The main premise being trying to avoid that dreaded shower fluctuation when an appliance or tap is in use.
So......
I was thinking of running a 22mm cold flow throughout the house T'ing of to 15mm for the various outlets, Keeping the 15mm runs as short as possible. The boiler supply will be closest to the stop cock so this should get fed 1st and should avoid the supply rate dropping to this i assume?
i am a bit stuck with the loft though. Should i run 22mm to the 1st floor, feed the 1st floor bathroom then continue up to the loft/2nd floor.
or....
is it worth running 2 separate 22mm flows, one to 1st floor bathroom, one to the 2nd?
My thinking is that if i do this then the loft supply shouldn't be interrupted by any use by the 1st floor. E.g. every room is running direct off mains pressure without interuption. Is my thinking correct?
I would also appreciate any thoughts on hoe to run the hot water. The issue there being it's a combi boiler, so only 1 15mm outlet to supply the whole house. So how to do i avoid drops there?
The boiler is 35kw and has a 14.5L flow rate. i have read that a 15mm pipe can only run max 8L/pm flow, so if i have 2 showers running and the boiler offers 14.5 per min, does it mean in effect the 2 showers would still be getting 7.25L/per min???
many thanks in advance
Carl
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