Hot Water Supply

[codswallop]

I have a combi-boiler that supplies both central heating and hot water.The downstairs kitchen sink has a good supply of HOT water,but the basin in the upstairs bathroom gets only medium/hot water.Can anyone suggest a reason why? Also there is a pressure gauge that has bo set at 1.5 is this to be done when the pump is idle or when it is running? Thanks.

[KARL]

Regarding the temperature disparity, have you let the water upstairs run for a good long while ? As the pipe run to there is (I assume) a good bit longer than to the kitchen, it is distinctly possible that it takes a while for the pipes and their immediate surroundings to warm up, not least if the insulation on the pipes is poor(er).

[codswallop]

Yes I have to do that especially when running a bath,you can put your hand under the flow with no discomfort.

[goodgoalie]

Funnily enough, I had a similar problem last night. When I ran a bath the water was hot, but only just hot enough for a bath without putting any cold in; but the water in the kitchen, which I don't run that often, is stonkingly hot, as it should be. The odd thing is that the combi boiler is in a cupboard opposite the bathroom!

I can only think it might have some thing to do with the fact that I'd just turned off the central heating five minutes before I ran the bath.

[malagabob]

The pressure gauge should be at 1.5 + or - 1 or 2 when the heating is off and cool. Try throttleling the flow rate back a bit after the basin tap is running at its hottest. See if it improves.

[codswallop]

Hi gg my wife always says "run the central heating" when running the bath,but I always thought that the two systems in the boiler were independant of each other,is this not so?
Thanks for the info malagabob.

[GRUMPY]

Heating and hot water will be seperate

[The Builder]

Yes, set the pressure to around 1.5 with the heating off, and the rads cool.

There is only one burner in a combi... one source used for heating and hot water.

First, I would check the temperature setting of the hot water side. Some people wrongly believe that turning it down to a silly level will save fuel. You may have a rotary dial. Set that to around the three-quarter mark - assuming you boiler is not undersized - in which case, maybe even to full power.
If it's a screen readout, set to around 60 degrees minimum.

[codswallop]

Thanks to you all for your replies.