4
Dimensions
PHYSICAL DATA
Central Heating (Sealed System)
125 / 150
160 / 200
Heat Exchanger Max Allowable Working
Pressure
50 psig [3.45 bar]
50 psig [3.45 bar]
Max System Pressure
43
.00
psig
[2.96 bar]
43
.00
psig
[2.96 bar]
Min System Pressure
7.25
psig [ 0.50 bar]
7.25
psig [0.50 bar]
Max System temperature
176°F
[80°C]
176°F
[80°C]
Pressure Relief Valve Setting
30
.00
psig [2.11 bar]
30
.00
psig [2.11 bar]
Expansion Tank Minimum Size
(pre-charge
press.)
2.2
gal at 11.6 psi
[10.0
L at
0.8 bar]
2.2
gal at 11.6 psi
[10.0
L at
0.8 bar]
Recommended System Pressure (cold)
21.7 psig [1.5 bar]
21.7 psig [1.5 bar]
Domestic Hot Water (Sealed System)
150
200
Max Inlet Water Pressure
116 psig [8 bar]
116 psig [8 bar]
Min Inlet Water Pressure
2.9 psig [ 0.2 bar]
2.9 psig [0.2 bar]
Min DHW Flow Rate
0.55 gpm [2.50 L/min]
0.55 gpm [2.50 L/min]
Max DHW Temperature
140°F [60°C]
140°F [60° C]
DHW Water Content
0.05 gal [0.23 L]
0.10 gal [0.37 L]
SYSTEM
When boiler is operating at maximum operating temperature, providing heating with all heat emitters operating, pressure gauge
should not indicate more than 26.11 psi / 1.80 bar. If reading exceeds this figure larger expansion tank is required.
PN 240012363 REV. A [08/31/2018]
DIMENSIONS
125 & 150
160 & 200
Height
30" [763 mm]
30 " [763 mm]
Width
17
3/4
" [450 mm]
17
3/4
" [450 mm]
Depth
14" [356mm]
23
"
[584 mm]
Condensate Trap Connection
3/4" NPT
3/4" NPT
System Supply
1" NPT
1" NPT
DHW Outlet (GMHB125 Optional)
3/4” NPT
3/4” NPT
Gas Connection
3/4” NPT
3/4” NPT
DHW (Cold Water) Inlet
3/4” NPT
3/4” NPT
System Return
1" NPT
1” NPT
Boiler Filling Connection
1/2" [15.9mm]
External to Boiler
Primary Water Content
1 gal [3.60 L]
1
1/4
gal [4.73 L]
B
A
C
D
E
F
G
H
I
J
