Compact size

Despite the small size of these boilers, they are high efficient equipment. They are made of stainless steel that extends the service life of the boiler and improves its heating characteristics and efficiency.

Easy installation and control

Despite simple design of the boiler, it provides effective operation and easy control. The function “absence” allows saving the fuel, simulteneously preventing the freezing of heating system.

Safety

Control board of combustion automatically stops the boiler operation, if in some cases the combustion doesn’t occur but the fuel (gas liquid fuel) is supplied.

Protection system in case of power failure

The boiler stops automatically functioning in case of power failure. When supplying electric power, the boiler automatically begins to operate.

Protection system from overheating

In case of lack of water in heating system or the breakage of control panel, the boiler temperature is increased. The protection against overheating of the boiler is automatically activated.

Protection against freezing

In winter the boiler turn on the circulated pump and burner in oreder to avoid the freezing of heating system.

Fan’s protection unit

In case of fan breakage, pressure drop and clog of smoke pipe, the boiler stops functioning.

Heat exchanger material

GTD series – stainless steel

GPD series – fire-resistant steel

Technical characteristics of NAVIEN boiler of GTD series

Model
535 GTD 735 GTD
Heated area m2 580 810
Heating capacity kW 58,1 81,3
Hot water pressure bar макс. – 9,8
Hot water productivity dT=25°C l/min 33 46
dT=40°C l/min 21 29
Max. heating temperature °С 80
Max. pressure in the system kg/sm2 3,5
Gas pressure mBar 15-27
Max. gas consumption m3/h 5,8 8
Efficiency % 89 88,6
Power supply V/Hz 220/50
Pipes diameter heating inlet/outlet mm 40
hot water supply inlet/outlet mm 20
gas inlet mm 15
chimney mm 148
Dimension W*D*H 547*850*1032 547*838*1240
Weight kg 160 193

Technical characteristics – Navien boiler of GPD series

Model 1035 GPD 1535 GPD 2035 GPD
Heated area m2 1160 1740 2320
Heating capacity kW 116 174.4 232.6
Hot water pressure bar макс. – 9.8
Hot water productivity dT=25°C l/min 63 81 130
dT=40°C l/min 42 54 87.8
Max. temperature of heating °С 80
Max. pressure in the system kg/sm2 3.5
Gas pressure mBar 10-27
Max. gas consumption m3/h (kg/h) 11.8 17 24
Efficiency % 81.3 85.5 84.6
Power supply V/Hz 220/50
Pipes diameter inlet/outlet heating mm 65 80
hot water supply inlet/outlet mm 20
gas inlet mm 20 25 32
chimney mm 200
Dimension W*D*H 769*1073*1411 796*1073*1464 796*1165*1588
Weight kg 290 390 470