Designation for a Electronic heater using
propane gas is “EP”;
a Electronic 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
Suffix “X” is for cupro-nickel tubing; “C” is
for copper tubing
Example: P-R130A-EN-X = Plastic headers,
130 model size, Electronic, 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.
|
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. |
|
|
______ |
Desired water temperature (°F) |
|
(minus) –
|
______ |
Average air temperature (°F) |
|
(equals) =
|
______ |
Required temperature rise (°F) |
|
(divided) ÷
|
______ |
Required time to heat pool/spa to
desired water temp. (hours) |
|
(equals) =
|
______ |
Required temperature rise per hour (°F) |
|
|
Model
|
Pool Size - Square Feet
|
|
300
|
400
|
500
|
600
|
700
|
800
|
1000
|
|
Desired temperature rise in °F per
hour
|
|
130
|
1.1
|
.9
|
.7
|
.6
|
.5
|
.4
|
.3
|
|
|
Model
|
Spa Size - Gallons
|
|
300
|
400
|
500
|
600
|
700
|
800
|
1000
|
|
Desired temperature rise in °F per
hour
|
|
130
|
43
|
32
|
26
|
21
|
18
|
16
|
13
|
|
