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Designation for a Digital heater using propane gas is
“EP”;
a Digital heater using natural gas is “EN”.
Designation for a Millivolt heater using propane gas is
“MP”;
a Millivolt heater using natural gas is “MN”.
Prefix “P” is for plastic (polymer) headers; “C” is for
cast iron (ASME) headers.
Suffix “X” is for cupro-nickel tubing; “C” is for copper
tubing
Example: P-R406A-EN-X = Plastic headers, 406
model size, digital, natural gas, cupro-nickel
Reduce input 4% for each 1000 feet above sea level when
installed above 2000 feet elevation.
Manufactured under Patent No. 3,623,458.
Plastic (polymer) headers cannot be used for
installations requiring ASME certification. |
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How to Pick the Right Size Heater
Proper heater size is based on the time required to heat
the pool or spa. If water is heated for each intended
use, energy-saving rapid heating may be appropriate.
If water is gradually heated to the desired temperature
and then maintained at that temperature, a smaller
heater may be acceptable. To determine proper heater
size, use the following formula. |
