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Think I am getting somewhere. I capped off the feed pipes to the Bristan thermostatic mixer shower and the problem was solved. The unit is by-passing cold water into the hot inlet pipe when a hot water demand is made from an adjacent tap. This is happening with the mixer off. With the shower...

This morning, with the CH off all night, running the tap furthest from the boiler resulted in a time delay of 3 minutes before the burner cut in and the water started to heat. I will try the same thing with the closest tap in the kitchen tomorrow and see what happens. Any ideas please?

Have now been able to check the system with the boiler cold. The boiler fires up straight away when the kitchen tap is turned on, and the water runs hot pretty quickly. In the morning when the CH has been off all night, the water in the bathroom takes a long time before it runs semi hot/warm. I...

It's a Powermax 155x, about 5 years old. Even though the burner did not cut in immediately, the water from the kitchen tap was hot. Is it possible that the boiler was already up to temperature because of central heating demand?

Thanks for the reply. Shower: It has a thermostatic mixer valve. Temperature is about the same at mid and fully hot. Basin: Is a standard one tap mixer. Both: Flow rates are reasonable and about the same throughout the flat. The burner cuts in 1-2 minutes after turning on the basin tap...

I have a gas combi boiler in my 2 bedroom flat which delivers scalding hot water to the taps in the kitchen and separate WC basin. However the water from the shower and taps in the two en-suite bathrooms is tepid. I have a British Gas contract, but they claim it is not their problem as the fault...