DIY Doctor

Hot Water in Cylinder but Only Getting Warm Water From taps

Postby Shafee » Sun Jan 26, 2020 12:08 pm

Hi all,

Over the last month we noticed water coming out of all the hot taps and shower would only come lukewarm. The puzzling thing is control unit states that the temperature in the unvented cylinder is at 69-70 degrees celsius. When I’ve I released water directly from the cylinder and felt the water flowing in to the tundish it is really hot - I suspect 69-70 degrees celsius. No error codes on the boiler itself. Pressure in both expansion vessels (heating and hot water) at recommenced values. No issues with the solar panels in the loft that I can tell - its just been recently serviced.

Also a few additional notes - all radiators get to temperature fine. There is no effect to the hot water situation when the radiators are on or off. Neither is the radiator temperature affected by running the hot water.

Before we pay to have a heating engineer out does anyone have any ideas of what might be going on? The hope of course is that it is a setting that I could adjust before we pay a professional.

A massive thanks in advance!

We have the following set-up:

* Boiler - Logic Heat 15 by Ideal
* Unvented cylinder - Range Tribune HE Indirect Solar TT300 by Kingspan
* Programmable thermostats and hot water timer by Danfoss (TP9000+TP5000Si)
* Solar panels - “Clearly Solar Collectors” by Glow worm
* Solar panel system - Solar pump station and system hydraulics by Glow worm
* Fluropro solar control by Glow worm
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Shafee
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