Specifications EX 400 EX 500 EX 700 EX 850
CSA Input (natural gas or propane) -
MBH
40-399 50-500 70 - 700 85 - 850
CSA Input (natural gas or propane) - kW 11.7 - 117 14.6 - 146.5 20.5 - 205 24.9 - 249
CSA Output - MBH 388 485 679 824.5
CSA Output - kW 114 142 199 241.6
Thermal Efficiency 97.9 97.5 97.0 97.0
Minimum gas supply pressure (natural
gas or propane) - inch w.c.
4 4 4 4
Maximum gas supply pressure (natural
gas or propane) - inch w.c.
14 14 14 14
Ambient temperature:
Low °F / °C
High °F / °C
32 / 0
122 / 50
32 / 0
122 / 50
32 / 0
122 / 50
32 / 0
122 / 50
Max. relative humidity (non-condensing) 90% 90% 90% 90%
Minimum water temp. °F / °C 34 / 1 34 / 1 34 / 1 34 / 1
Maximum water temp. (electronic hi-
limit) °F / °C
190 / 88 190 / 88 190 / 88 190 / 88
Max. ΔT - supply/return (electronic
fence) °F / °C
80 / 44 80 / 44 80 / 44 80 / 44
Max. Water Temperature Lockout Limit
°F / °C
201 / 94 201 / 94 201 / 94 201 / 94
Power use (120Vac/60Hz) @ full fire -
Watts (less pumps)
150 210 195 228
Weight (empty) - lbs/Kg Approx. 414 /
188
Approx. 441 /
200
Approx. 486 /
220
Approx. 510 /
231
Heating surface area - ft
2
/ m
2
55.3 / 5.14 72.9 / 6.77 84.6 / 7.86 99.88 / 9.28
Pressure vessel water content -
USG/Liters
13.5 / 51.1 12.4 / 46.9 17.5 / 66.3 16.4 / 62.0
Maximum boiler flow rate - USgpm 100 100 100 100
Minimum boiler flow rate - USgpm 10 12 18 21
Maximum operating water pressure* -
psig
160 160 160 160
Minimum water pressure - psig 8 8 8 8
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