Internal By-Pass
Model Min GPM
H150FD
H200FD
20
H250FD
H300FD
25
H350FD
H400FD
30
H400FD
40
Maximum water flow 125 GPM
Flow requirements should be checked to insure proper operation.
Never allow heater to operate below minimum flow requirements or damage may
occur.
• Flow less than minimum could cause issues such as the heater dry firing or water to boil
causing high limits to trip and possible damage to heat exchanger.
• Flow exceeding maximum flow could cause issues such as damage to the heat
exchanger by thinning the tube walls.
Flow Requirements
NOTE: Internal by-pass
should be inspected
periodically as it could
be the cause of low or
high water flow through
the exchanger
61
Heat Exchanger: Flow Requirements
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