"Cottage" implies small.
Fitting a 28 kW boiler where the demand is for less that 8 kW is going to create so many problems.
You seem to think that a more powerful boiler is going to warm it up more quickly. Thats irrelevant because once the system water has heated up in say 20 minutes the heat output will be limited by the radiator sizes.
The solution is to have a proper sized boiler of perhaps 12 kW and to time or remotely switch it on before you get there or on a timeclock if thats a regular day/time.
Using an electric fan heater to quickly warm up the air is the solution to fast warm up.
Tony
Fitting a 28 kW boiler where the demand is for less that 8 kW is going to create so many problems.
You seem to think that a more powerful boiler is going to warm it up more quickly. Thats irrelevant because once the system water has heated up in say 20 minutes the heat output will be limited by the radiator sizes.
The solution is to have a proper sized boiler of perhaps 12 kW and to time or remotely switch it on before you get there or on a timeclock if thats a regular day/time.
Using an electric fan heater to quickly warm up the air is the solution to fast warm up.
Tony