Heat treatment | Archive Titles

How to specify a condensing boiler in a typical installation with a 240 kW load
	Cascade of three wall-hung condensing boilers	Floor-standing compact condensing boiler	Floor-standing condensing boiler	Cast iron with stainless steel condensing heat exchanger
Buderus example	GB162 3 x 80 kW	GB312 240 kW	SB615 240kW	GE315 PLUS 260 kW
Efficiency	Up to 110% NCV **	Up to 108% NCV **	Up to 109% NCV **	Up to 107% NCV **
Built in back-up if one boiler is not in operation	**
Ease of transportation into the heating room	Weight of each unit only 70 kg **	Only 60 mm wide with transport frame **		Assembly in heating room *
Installation space	Up to 400 kW in 1 m² **	**	*
Integration into existing large-volume heating systems	Recommend installation with low-loss header and strainer *	Recommend installation with low-loss header and strainer *	**	**
Maximum system pressure	400 kPa required. For larger pressures, install with separated plate head *	400 kPa required. For larger pressures, install with separated plate head *	500 kPa **	600 kPa **
Modulation range	Down to 19 kW **	Down to 66 kW **	About 70 kW depending on type of pressure jet burner *	About 70 kW depending type of pressure jet burner *
Noise level	Whisper quiet 55 dB(A) *	Whisper quiet 55 dB(A) *	Depends on type of pressure jet burner chosen. Normally 60-70 db(A). Use of burner hood can reduce noise level *	Depends on type of pressure jet burner chosen. Normally 60-70 db(A). Use of burner hood can reduce noise level *
Weight suitable for rooftop installation	**	**
Maximising efficiency of systems with high and low-temperature heating circuits			Separate connections for low and high-temperature returns as standard **	Two return connections on the condensing heat exchanger **
Summary	Everyone’s favourite. Can be adapted to any system but must have low-loss header and the heating circuits must be balanced. Where the heating system is old or high system pressure is required, separate from the system with a plate heat exchanger	Similar to the cascade of wall-hung boilers, but because it is a single boiler, total installation costs are lower. However, you do not have the back-up cover of the cascade	The best for big systems of high water content, especially old heating systems. However, you need to have good access	The problem solver. For systems with high water content, especially old heating systems where access is difficult
* Good solution for this type of installation
** Excellent solution for this type of installation