MD series boilers

MD series boilers intended use (are used) for heating of large sized residential and industrial premises and supplying heat for technological needs. Fuel used: wood pellets or wood briquettes up to 50mm diameter.

These boilers are manufactured as a modification to K series with a mounted wood pellet/briquette burner of a corresponding output with it’s own fuel supply augers.

When pellets are not available boiler may be stoked manually with any type of solid fuel.

Boiler burner is delivered with pellet or pellet/briquette supply augers. Fuel hoppers are delivered separately.

Product Description

Boiler model		K-100MD	K-140MD	K-190MD	K-250MD	K-320MD	K-400MD	K-500MD
Boiler tipe		Solid fuel fired hot water generator with automated burner (smoke tubes)
Nominal heating capacity (QN), kW		95	140	190	250	320	400	500
Minimal heating capacity (Qmin), kW		30	42	57	75	96	120	150
Efficiency of boiler not less than, %		85	85	85	85	85	85	85
Types of fuel		Fire wood, wood waste, coal or burner fuel

Fuel consuption, kg/h		24	34	46	60	77	97	121
Door dimensions B x H, mm:		400×450	400×450	600×620	600×620	600×620	600×620	600×620
Combustion chamber	H, mm	620	620	770	770	900	900	1100
	B, mm	500	520	770	770	900	900	900
	L, mm	730	1000	1100	1500	1300	1500	1700
	capacity, dm3 (1)	226	320	590	800	1050	1210	1680
Aerodynamic resistance, at QN, no more than, Pa		75	105	135	150	215	225	260
Temperature of combustion gases escaping from boiler, °C		213	213	213	213	213	213	213
Gas emission m3/val.		418	591	800	1044	1340	1688	2105
Smoke exhaust pipe dimensions, mm		240×240	240×240	240×240	Ø350	Ø350	Ø380	Ø380
Operating water pressure, MPa (bar)		6 (0,6)	6 (0,6)	6 (0,6)	6 (0,6)	6 (0,6)	6 (0,6)	6 (0,6)
Minimum return water temperature during operation, ºC		60	60	60	60	60	60	60
Maximum operating temperature of the water in the boiler, ºC		110	110	110	110	110	110	110
Water debit, at Δt =20 ºC, t/h		4,26	5,97	8,11	10,68	13,67	17,09	21,37
Min debit, t/h		2,87	4,01	5,45	7,17	9,17	11,46	14,33
Hydraulic resistance at Δt =20 ºC, mm H2O st		0…370	0…380	0…390	0…402	0…422	0…430	0…430
Boiler water capacity, m³		0,22	0,27	0,53	0,68	0,94	1,12	1,3
Boiler heating surface, m²		5,1	6,9	9,6	12,4	15,9	19,8	24,8
Connection pipes	conditional diameter, mm (inches)	68 (2,5″)	65 (2½”)	65 (2½”)	65 (2½”)	80 (3″)	80 (3″)	80 (3″)
Connection pipes	flange, Ø mm	160	160	160	160	185	185	185
Weight no more than, kg		800	900	1100	2200	2800	3100	3900

Dimensions

Boiler type	*K-140MD*	*K-190MD*	*K-250MD*	*K-320MD*	*K-400MD*	*K-500MD*
H, mm	1940	2260	2260	2680	2830	2830
B, mm	1000	1200	1200	1400	1400	1400
L, mm	1620	1950	2150	2400	2600	2760
A, mm	710	890	890	1090	1090	1090
C, mm	1125	1600	1600	1600	1670	1770
D, mm	380	380	380	480	480	480
E, mm	1600	1900	1900	2220	2220	2370
F, mm	674	780	780	780	780	780
G, mm	1120	1300	1300	1490	1490	1640
K, mm	415	540	540	540	540	540
M, mm	260	270	270	380	380	380
T, mm	ø65	ø65	ø65	ø80	ø80	ø80
P, mm	240×240	290×290	290×290	ø325	ø325	ø325
R, mm	1614	1728	1728	1728	1900	1900

Schemes

Recommended connection to the heating system diagram:

MD series boilers

Kalvis Rīga

Domestic boilers

Industrial boilers