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I am not an installer and I don't know the brand. I guess you will have to do some research, but if you trust your gas engineer then that won't be necessary.

T4R won't work with the old receiver and normally the new receiver should be included with the T4R, but I have seen on eBay some people sell new T4R without the receiver so be careful when buying. I am not sure about binding T3R to old receiver (I am guessing BDR91). According to the Resideo...

IMO T4R is the closest replacement of CM927. The only difference I have notice after almost a month of usage is the current temperature display scale. Instead showing temperature in 0.1 deg C it shows in 0.5 deg C. It was a bit annoying when I noticed first, but now it doesn't bother me that...

I just installed my T4R yesterday. My CM927 has died during the screen fix operation. It lasted 10 years. RIP CM927. I think that some of the CM927 functions were doubled, like the party mode or day off. On T4R you can achieve the party mode by simply overriding the setpoint in the auto mode and...

Yes, exactly.

Hello all, The Y plan with the Honeywell V4073A Mid position valve has a small design flaw, where the valve motor can stay continuously powered up when it doesn't need to. It happens when the CH was the last demanded position (according to my knowledge). I know that the motor is design to endure...