Product Description
Greenstar – 6721822579 (2021/01)
22
ZWB 42-3 A...
Input/Output at elevation 0 - 2000 feet (0 - 610 m) Unit NG LPG (propane)
Max. input rate 180/79 °F (82/26 °C) BTU/hr (kW) 151,600 (44.4) 148,300 (43.5)
Max. output rate 104/86 °F (40/30 °C) BTU/hr (kW) 137,500 (40.3) 137,500 (40.3)
Max. output rate 122/86 °F (50/30 °C) BTU/hr (kW) 137,500 (40.3) 137,500 (40.3)
Max. output rate 176/140 °F (80/60 °C) BTU/hr (kW) 134,400 (39.4) 134,400 (39.4)
Output rate domestic hot water (DHW), 113 °F (45 °C) BTU/hr (kW) 137,500 (40.3) 137,500 (40.3)
Output rate domestic hot water (DHW), 140 °F (60 °C) BTU/hr (kW) 135,800 (39.8) 135,800 (39.8)
Min. input rate 180/79 °F (82/26 °C) BTU/hr (kW) 36,000 (10.5) 46,400 (13.6)
Min. output rate 104/86 °F (40/30 °C) BTU/hr (kW) 35,500 (10.4) 46,400 (13.6)
Min. output rate 122/86 °F (50/30 °C) BTU/hr (kW) 35,100 (10.3) 46,100 (13.5)
Min. output rate 176/140 °F (80/60 °C) BTU/hr (kW) 31,700 (9.3) 42,000 (12.3)
Input/Output at elevation 2000 - 4500 feet (611 - 1372 m) above sea level
Max. input rate 180/79 °F (82/26 °C) BTU/hr (kW) 136,440 (40.0) 139,402 (40.9)
Max. output rate 104/86 °F (40/30 °C) BTU/hr (kW) 123,750 (36.3) 129,250 (37.9)
Max. output rate 122/86 °F (50/30 °C) BTU/hr (kW) 123,750 (36.3) 129,250 (37.9)
Max. output rate 176/140 °F (80/60 °C) BTU/hr (kW) 120,960 (35.5) 126,336 (37.0)
Output rate domestic hot water (DHW), 113 °F (45 °C) BTU/hr (kW) 123,750 (36.3) 129,250 (37.9)
Output rate domestic hot water (DHW), 140 °F (60 °C) BTU/hr (kW) 122,220 (35.8) 127,652 (37.4)
Input/Output at elevation 4500 - 7000 feet (1373 - 2134 m) above sea level
Max. input rate 180/79 °F (82/26 °C) BTU/hr (kW) 125,828 (36.9) 129,021 (37.8)
Max. output rate 104/86 °F (40/30 °C) BTU/hr (kW) 114,125 (33.5) 119,625 (35.1)
Max. output rate 122/86 °F (50/30 °C) BTU/hr (kW) 114,125 (33.5) 119,625 (35.1)
Max. output rate 176/140 °F (80/60 °C) BTU/hr (kW) 111,552 (32.7) 116,928 (34.3)
Output rate domestic hot water (DHW), 113 °F (45 °C) BTU/hr (kW) 114,125 (33.5) 119,625 (35.1)
Output rate domestic hot water (DHW), 140 °F (60 °C) BTU/hr (kW) 112,714 (33.0) 118,146 (34.6)
Gas connection value
Natural Gas – H
s
= 1,010 BTU/ft
3
(37.3MJ/m
3
) BTU/ft
3
(MJ/m
3
) 149 (4.2) –
Liquid Propane Gas – H
D-S
= 2,500 BTU/ft
3
(93.1MJ/m
3
)BTU/ft
3
(MJ/m
3
) – 59 (1.7)
Permissible inlet gas pressure
NG " W.C. (mbar) 3.5-10.5 (8.7-26.1) –
LPG (propane) " W.C. (mbar) – 8-13 (19.9-32.3)
Expansion vessel
Pre-charge pressure psi (bar) 10.9 (0.75) 10.9 (0.75)
Total contents gal (l) 3.17 (12) 3.17 (12)
DHW
Max. DHW flow rate gpm (l/min) 3.963 (15) 3.963 (15)
Nominal DHW flow rate (at 140 °F (60 °C) outlet temperature) gpm (l/min) 3.61 (11.4) 3.61 (11.4)
Outlet temperature °F ( °C) 104 - 140 (40 - 60) 104 - 140 (40 - 60)
Max. cold water inlet temperature °F ( °C) 140 (60) 140 (60)
Max. approved DHW pressure psi (bar) 150 (10.3) 150 (10.3)
Minimum water pressure psi (bar) 4.35 (0.3) 4.35 (0.3)
Flue gas
Flue gas mass flow at maximum/minimum nominal output
g/s
18.0/4.5 17.5/5.6
Flue gas temperature 176/140 °F (80/60 °C) at maximum/minimum nominal heat input °F ( °C) 171/135 (77/57) 171/135 (77/57)
Flue gas temperature 104/86 °F (40/30 °C) at maximum/minimum nominal heat input °F ( °C) 133/91 (56/33) 133/91 (56/33)
CO
2
at max. nominal output % 9.4 11.0
CO
2
at minimum nominal output % 8.6 10.4
Condensate
Max. condensate quantity (t
R
= 86 °F (30 °C)) gph (l/h) 0.9 (3.5) 0.9 (3.5)
pH level, approx.
– 4.8
4.8
General
Voltage AC ... V 120 120
Frequency Hz 60 60
Max. power consumption (central heating mode) W 205 205
Max. power consumption (Stand-by) W <6 <6
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