bath hot water temp

[erj]

Hi Guys, fitted a potterton 28 kw combi every thing works fine, but there is all ways a but.
The hot water to the WHB, kitchen and showers great red hot, bath they do not have to put any hot water in, def a temp diff.

Now all the pipe work is in 15, inc the bath which is first on the run and pipes are insulated, stuck any one any ideas.

Thanks

 

[Chalked]

Quite simple.
the bath flow rate is higher .:coffee:

 

[Alex Knight]

What do you mean by "bath they do not have to put any hot water in"? Did you mean to say they don't need to add any cold water?
Have you looked at the pipework under bath? Tmv under there?

 

[kris]

Thd bath flow is higher meaning the boiler can't heat the water fast enough with the speed it comes out the bath tap. Where as the basin is much slower so heats water better.

 

[erj]

woops sorry yer they dont have to put and cold in.! No TMV I fitted the system

 

[erj]

Hi Kriss, but the pipes are in 15 the same it just the tap that is bigger, would that make the diffrance.

 

[kris]

Lower kw Combis aren't good for baths . I've had loads of customers complaining that there boiler struggles to fill baths so they need to close the tap to get desired temp. This is something I always factor in when fitting a new combi. Do they have a bath.

 

[dancinplumba]

Put iso on bath feed and reduce flow

 

[village idiot]

Encourage them to fit a thermostatic bath/shower mixer, SORTED

 

[Chalked]

The bath tap will probably flow about 18litres a min. The 28kw combi at this time of year will do about 12-14 litres @ 55-60degrees.
modern basin taps pass 6litres, so will be hotter, but with less flow.

 

[Ermintrude]

As above too much flow

 

[plumben]

I find a ISO and non return reduce the flow quite a bit

 

[SimonG]

Too much flow. Need a valve on the bath to create a restriction. Number of times i have to tell custs when swapping to a combi is unreal. I just fit a valve on bath hot and restrict flow.

No hassles