strange hot water

Aug 03, 2020 14 Replies

just down at the static van and I thought I would take a bath rather than a shower.....anyway water at the sink is scalding ....shower with the mixer up the right way up now is working well...the whb is pretty hot but the bath water is temped at the most... anybody got any idea why this is the case ? ....all about the same distance from the Worcester combi.....whb and bath have separate hot and cold taps....sink is a mixer


That?s one of the issues with Combi?s, the flow of water ca n be greater than the boilers ability to heat it. The only remedy is to slo w the rate of the water and fill the bath slower but then catch 22 comes in to play in that by the time you have filled the bath it has gone tepid any way.

Richar

or either:

The combi boiler is undersized. to fill a bath, you are looking at a

38kW boiler.

the DHW FPHE is scaled up affecting thermal energy transfer from the boiler internal water to the incoming cold mains water

(DHW FPHE is Domestic Hot Water Flat Plate Heat Exchanger)

S.

haveyougottheinstructionsforthewaterheaterandhaveyoureadit......tee hee.

Cheers, T i m

Assuming your mains water pressure and delivery rate are up to it, plus the distance from meter to boiler might need 28mm gas pipe.

it's a Worcester 24i propane....sink scalding at full flow rate......whb scalding at full flow rate...bath tepid at full flow rate...not too bad at slow flow rate.....just have to live with it.....no water temp adjustment on the boiler...thanks all except tim .....

I for one only read instructions as a last resort......I understand why you read them ....

all I can think is that the bath tap has a MUCH greater flow rate than the sink and whb....doesn't seem like that though ....

Hot water is being diluted by cold somewhere.

Before it gets to the control you're using.

Paul

Stick a bucket (or bowl, or other reasonable size container) under the taps & measure them.

Andy

well it is open to the elements under the van ....but wouldn't have thought

They may be a Thermostatic mixing valve inline with the bath hot tap.

In Scotland it?s a legal requirement to fit either a thermostatic mixer or an in-line mixing valve in the hot supply for baths on new installations. I don?t know how long this has been the case for.

Tim

"Includes site fees for 2012"

That's useful.

Do they only come with that s***ty coloured settee and curtains, or is that a reflection of the tastes of a typical 'owner' ?.

covered up the couch and changed all the drapes I'll do a video if you want....

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