ENGINEERING DATA

HEATER GAS SUPPLY AND PIPE SIZING INFORMATION

“RESIDENTIAL” PROPANE GAS 2 STAGE REGULATION

In many Propane gas line installations, the gas supplier and or installer will utilize a two stage regulation process

whereby, at the supply tank, they will install the first stage gas regulator, which would be at a higher pressure,

usually 10 psi. This higher pressure allows for much longer distance and in a much smaller pipe size. Then, within a

short distance from the pool heater, generally around 24 inches, a second regulator, which is the second stage,

would be installed and set at the required inlet pressure of the heater.

SEE “GAS PRESSURE REQUIREMENT CHART.”

Stage One “High Pressure” Gas Pipe Sizing

Stage Two “Low Pressure” Gas Pipe Sizing

10PSI@2500BTUPerCU.FT.

Stage2setat14in.W.C.

75 through 400

1/2 in.

1/2 in.

1/2 in.

75 through 400

3/4 in.

3/4 in.

“RESIDENTIAL” NATURAL GAS 2 STAGE REGULATION

In many Natural gas line installations, the gas supplier and or installer will utilize a two stage regulation process

whereby, at the street’s main gas supply, they will install the first stage gas regulator, which would be at a higher

pressure. This higher pressure is usually set at 2 psi or 5 psi and can be run for long distances and in a much smaller

pipe size. Then, within a short distance from the pool heater, generally around 24 inches, they will install a second

regulator, which is the second stage. This second stage regulator would be set at the minimum operating pressure

for the heater. For “Natural Gas Pentair Pool Heaters” the minimum is 7 inches W.C.

Stage One “High Pressure” Gas Pipe Sizing

Stage Two “Low Pressure” Gas Pipe Sizing

2PSI@1000BTUPerCU.FT.

Stage2setat7in.W.C.

75 through 400

3/4 in.

1 in.

1-1/4 in.

75 through 300

3/4 in.

1 in.

MAXIMUM EQUIVALENT PIPE LENGTH

Model

0to50Feet

50 to 100 Feet

100 to 150 Feet

MAXIMUM EQUIVALENT PIPE LENGTH

Model

0to10Feet

10 to 20 Feet

MAXIMUM EQUIVALENT PIPE LENGTH

Model

0to20Feet

20 to 90 Feet

90 to 200 Feet

MAXIMUM EQUIVALENT PIPE LENGTH

Model

0to5Feet

0to15Feet

350 & 400

1 in.

1 in.

Stage One “High Pressure” Gas Pipe Sizing

Stage Two “Low Pressure” Gas Pipe Sizing

Stage 2 set at 7 in. W.C.

75 through 300

3/4 in.

1 in.

MAXIMUM EQUIVALENT PIPE LENGTH

Model

0to50Feet

50 to 100 Feet

100 to 200 Feet

MAXIMUM EQUIVALENT PIPE LENGTH

Model

0 to 5 Feet

0 to 15 Feet

75 through

400

5PSI@1000BTUPerCU.FT.

3/4 in.

3/4 in.

3/4 in.

350 & 400

1 in.

1 in.

E

N

G

I

N

E

E

R

I

N

G

D

A

T

A

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