Adjusting heating to be less noisy

[stiff walrus]

My boiler is super noisy when activating. I have 1 room in the house that pets are in that needs to be kept at 17C overnight, it's also the least insulated being a converted garage. Another room needs to be kept at 17C but it maintains heat a lot better.

I use Drayton wiser TRVs and been pretty happy with them but my issue is that the boiler kicks on very frequently sometimes waking us up.

I'm trying to think of ways to keep it quieter. I was thinking of a way to overshoot the 17C temperature each time it goes below 17C, to 19C to reduce the frequency of boiler firing up (drayton wiser doesn't support this). And also heat the secondary room whilst the boiler is already running.

Does anyone have any other ideas? Besides room insulation / boiler replacement.

[ember mantle]

Do your TRVs have a temperature calibration entity associated with them?
You could quite easily set an automation that would set that to -2C when the TRV starts heating, and then back to 0C when it stops, that would cause it to overheat by 2C. You could do the same with your secondary room TRV too, which would keep it within the 17-19C range while the pet room is heating, and as it's better insulated would be unlikely to trigger the boiler at another time

failing that, you could do the same with the actual temperature set point

[stiff walrus]

Unfortunately there is no calibration setting. Yeah the set point should work. I think if I reset the mode to automatic in the morning then it means my daytime schedule can remain unchanged

[ember mantle]

Yeah you'd want to do:
Nighttime -> set hvac mode -> heat, temperature to 17
During Night: current action -> heating -> set temperature to 19/ current action -> idle -> set temperature to 17
Morning -> set hvac mode -> auto