Glowworm Ultimate3 35C

Joined
17 Jan 2006
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Location
Derbyshire
Country
United Kingdom
I’ve recently had my boiler replaced to the Glowworm Ultimate 35C and now when I’m using the thermostatic shower you can feel the temp fluctuating up and down constantly. It doesn’t go cold but you can feel the difference all the time. Watching the boiler and it changes from 1.6-1.7-1.8-1.6-1.7-1.8 bar in-line with the temp changes. Is this normal or should I get the fitter back out to it?https://share.icloud.com/photos/0ItUEEteJahRzEn-qX6uZpRlA
 
Last edited:
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Remove the shower spray head and run with just the hose , does the temp stay constant ?
 
I’ve tried it with the kitchen tap which is just hot water only and it still does the same. I thought it might be the mixer valve causing problems but it’s been fine for the last few weeks since install.
 
Try setting the temp control at the boiler down a bit and see if it still happens
 
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What's the boiler hot water temperature set to? Normally if you've a thermostatic shower the shower valve will require a hot inlet temperature somewhat higher than its regulated
outlet temperature..perhaps a minimum of 55 or even 60 degrees inlet.
 
Plumber has tried turning the hot water temp down to see if it helps. It sounded like it had a lot of air in the pump but the radiators are all bled.it’s set to 50c to try for now.
 

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