hot water flow

JOPLUMB · Posted: Sat Feb 11, 2006 12:43 pm Post Subject: hot water flow

installed a bath on a like for like basis, using existing 22mm copper (on an older style house).Hot water is fed from a combi in cupboard next to bathroom. hot flow is poor...would changing a section of 22mm to 15mm upto tap make for better pressure???

Prof.plumb · Posted: Sat Feb 11, 2006 12:48 pm Post Subject:

Give it a go jo. It might work. How did you isolate the hot water?

croydoncorgi · Posted: Sat Feb 11, 2006 4:59 pm Post Subject:

Why would making a pipe SMALLER improve the flow???? Bigger pipes = less resistance = more flow.
Or do you mean that the water flow is OK but not hot enough (= boiler not man enough).
Or water takes a long time to get hot (MIGHT be due to large static volume in 22 mm pipes but unlikely to be significant).
Or do you mean something else entirely?

JOPLUMB · Posted: Sat Feb 11, 2006 6:36 pm Post Subject:

Prof.plumb wrote:

Give it a go jo. It might work. How did you isolate the hot water?

Sandard 22mm isolation valve.

JOPLUMB · Posted: Sat Feb 11, 2006 6:40 pm Post Subject:

croydoncorgi wrote:

Why would making a pipe SMALLER improve the flow???? Bigger pipes = less resistance = more flow.
Or do you mean that the water flow is OK but not hot enough (= boiler not man enough).
Or water takes a long time to get hot (MIGHT be due to large static volume in 22 mm pipes but unlikely to be significant).
Or do you mean something else entirely?

no prob with temperature , just thought the combi would give a good flow..( very old brown baxi combi )

Softus · Posted: Sat Feb 11, 2006 7:13 pm Post Subject: Re: hot water flow

JOPLUMB wrote:

installed a bath on a like for like basis, using existing 22mm copper (on an older style house).Hot water is fed from a combi in cupboard next to bathroom. hot flow is poor...would changing a section of 22mm to 15mm upto tap make for better pressure???

No. It wouldn't.

In any case you don't need to change the pressure, you need to increase the flow. However, you might not be able to.

Why are you rolling your eyes?

ChrisR · Posted: Sat Feb 11, 2006 7:34 pm Post Subject:

prof. plumb wrote:

Give it a go jo. It might work.

More absolute bloody rubbish from him.

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What combi is it?

Measure the flow, at showering temperature, into say a 9 litre bucket, and tell us what you find. Should be say about a minute a bucket, probably.

b00linib · Posted: Tue Feb 14, 2006 9:40 pm Post Subject:

make sure you lagged it. and turn up your thermosat. not too high.