Low / fluctuating hot water pressure.

Hello, I have a Bristan Shower with this particular valve which has started to develope a problem with hot water pressure over the past 9 months. When using the shower, cold water pressure is fine, turning hot water reduces to a trickle at it's worse. Turning the temperature dial rapidly from hot to cold will some time rectify the problem for a few minutes, but hot pressure soon drops again. Invented system, with fantastic hw pressure to all other outlets in the house. Is this a cartridge problem or wax thermostat piston? Thanks
Asked 5 years ago by Andrew
With the Sirrus 1800 series that in almost every occasion the first thing to do is give them a strip down clean and lube and fit a service kit, this will cure 85% of any problems and it is also the cheapest thing to do.

If after servicing you find out that it needs a thermostat or piston, nothing is really lost because it almost certainly needed a service in any case



The 1800

www.showerdoc.com/sirrus-thermostic-cartridge-1850-968-sk1850-2

There is no real difficulty with this valve however it is a little more complicated than the 1500 just take photos as you strip it down you can then refer to them when you are rebuilding.

www.youtube.com/watch?v=mjrwvPjUMCU

www.youtube.com/watch?v=bQnHGckfW-g

Answered 5 years ago by Barrie Seabright

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