Drop in Temperature on Bar Shower

[Keith Colts]

Can you help. I'm on an unvented system, have 3 Aqualisa Midas 110 showers which all give good showers. One started running luke warm (about 5 years old). I took it off and cleaned the filters (though they looked ok) but without success. So I thought it was probably the thermostat and I bought a bran new Midas 110 shower. But it has exactly the same problem? Even when I ratchet it up to max.

The bathroom is a good distance from the tank but there is (very) hot water running to the sink in the same bathroom. And when I switch on the water WITHOUT the shower being attached at all, I get a good flow of hot and cold water spurting out horizontally from each inlet. My eye tells me the hot water flow is less, but it is still a good flow. See attached vido.

I've read that these showers can accommodate a small difference in flow / pressure, and that the hot water will never be as powerful as the cold. So, I am stumped.

Anyone got any ideas?

 

[cross thread]

Check mixer taps / shower valves one may be passing cold into the hot

 

[CountryFan]

Video doesn’t play, nor do I have the option. Check with above first. When was the cylinder last serviced?

 

[Keith Colts]

Thank you for those ideas. Whole system was checked last year and the showers in other bathrooms, including adjacent bathroom on the same loop, working fine.

Existing shower and new shower both Midas 110 by aqua Lisa. Existing shower worked for years before temperature dropped. But new shower has exactly the same problem so suggests it’s something in the feed.

Only way I could test the feed was to take the shower off and, by eye, there appears to be a good flow of both hot and cold.

Sorry, the website wouldn’t allow me to upload the video so I took a still from it.

I’m scratching my head.