low pressure upstairs hot taps

tcwozere · 17 Aug 2003

just had a worcester 28cdi installed. the boiler is downstairs, and the flow at the downstairs hot tap is ok. the problem is the upstairs hot taps, (run of about 3 foot from boiler), both the bath and basin tap are at a trickle. i have had a look under the bath, and it seems the out from the bolier, (at 15mm), goes into a 22mm under the floor.. could this be the cause of the problem? or am i expecting to much from the combi?

thanks

tony

COG · 17 Aug 2003

Before you go looking for a blockd pipe you need to check the flow rate at your taps properly, a sink tap with an insert will spray water and look a lot faster than a larger unrestricted bath tap, its a common mistake to think the flow is a lot less, measure useing a flow cup (about £10) or time how long to fill a jug etc ,the 28cdi should be 10lt per min at max flow

tcwozere · 18 Aug 2003

Thanks for the reply..

Guess looks can be decpetive, the downstairs tap is running at 7.5l per min.. The bathroom sink is at 8.5l and the bath is also 8.5l a minute, (with the dial on the boiler set between II and III). Have spoken to our local water authority, and they are sending a guy out to check the mains pressure tomorrow.

corgiman · 25 Aug 2003

it is probably due to the pipes to the bath a basin have been installed in 22mm pipe which will increase flow rate but reduced pressure where as the hot water tap in the kitch is probably 15mm

was this a conversion on a new install?

COG · 25 Aug 2003

22mm or 15mm wont make a diff to the flow rate, its allready resticted at the boiler, you could run it through a drain pipe it would'nt come out faster than the 10 lt flow restricter

corgiman · 26 Aug 2003

COG said:
22mm or 15mm wont make a diff to the flow rate, its allready resticted at the boiler, you could run it through a drain pipe it would'nt come out faster than the 10 lt flow restricter

quite agree but it will reduce pressure

tcwozere · 26 Aug 2003

Thanks for the replies guy's..

its a conversion... water board have been and gone, they reckon the cold flow into the house is around 14l a min.. it still seems "wrong".. when you first open either hot tap upstairs, you get a gush, which then goes back to what seems like a slow trickle... guess its a trade off from the conventional boiler we had that gave good service water wise, but was lousy at heating the house in the winter...

ChrisR · 26 Aug 2003

COuld be some air trapped in a dead leg somewhere, behaving like a spring which compresses when the tap is off.

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low pressure upstairs hot taps

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