hot water outlets fine near boiler but poor temp on farthest outlet

[WYPSGrant]

Got me a bit of a head scratcher. Hot water outlets on basin and sink taps are ok but Bath outlet is very poor. Temperature is only reasonable when tap is throttled back to nearly a dribble. Thinking thermistors and plate to plate but otherwise I'm stumped. It's a Glowworm 30 Cxi combi
Thanks Grant

 

[Meady]

If it's always been like this its will be due to the fact that the tap is allowing to much water through when fully open for the combi boiler to heat it up to temperature properly.

Hence why when you turn the tap down it can cope with the flow of water better bad heat it up more.

 

[IDCHAPPY]

It's a combi boiler mate, that's about as good as it gets unfortunately. I have the same deal with my 28kw vaillant, even a 40kw boiler isn't going to give you wonderful flow rate at a bath tap

 

[Masood]

Do a little experiment - measure the flow rate at sink and basin hot taps, then measure at the bath tap with it throttled back till it gives a decent temperature. I'll bet you the flow rates will all be similar at similar temps. Bath taps just look like they're only giving a dribble because they are bigger.

 

[WYPSGrant]

Thanks guys but the customer had no problems in the past and the boiler has been in for about 5 years. So for it to flare up now seems strange. Ill have to check to make sure the diverter is operating correctly too. Am I right in saying that the cxi has a filter on the inlet too.

 

[acecharly]

dhw pressure switch maybe?

 

[stevetheplumber]

if you have hot water at the right temperaturte at some taps can you explain the logic of you decision its a boiler problem

 

[WYPSGrant]

Well Stevetheplumber I'd like to hear what you have to suggest since you haven't offered a hint of another possible cause. What's your logical explanation?

 

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