- Joined
- 22 Jan 2007
- Messages
- 8,310
- Reaction score
- 4,131
- Country
I reckon it's because on standard efficiency range rateable boilers you couldn't really go wrong, high water content could take over heating and general abuse, and setting a low burner pressure sorted most issues, and allowed for future expansion,
Premix zero governor boilers can only turn down so much, generally not nearly as much as std efficiency units, also they must light at a semi high rate, normally around 3/4 full power, so oversizing besides lowering efficiency also causes noise and cycling issues that often can't be overcome
Premix zero governor boilers can only turn down so much, generally not nearly as much as std efficiency units, also they must light at a semi high rate, normally around 3/4 full power, so oversizing besides lowering efficiency also causes noise and cycling issues that often can't be overcome