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8200 N. Austin Ave
 Morton Grove
IL 60053
USA
 Tel 847 966-3700
Fax 847 966-9052
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 Heating System Selection Guide
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| Net |
Longest loop in
system (supply and return total) |
| BTUH |
1-50' |
51-100' |
101-150' |
151-200' |
201-250' |
251-300' |
301-400' |
401-500' |
50,000
(5 gpm) |
NRF-9F/LW |
NRF-22 |
NRF-22 |
NRF-22 |
PL-30 |
PL-30 |
PL-36 |
PL-36 |
100,000
(10 gpm) |
NRF-22 |
NRF-22 |
NRF-33 |
PL-30 |
PL-30 |
PL-30 |
PL-36 |
PL-36 |
125,000
(12.5 gpm) |
NRF-22 |
NRF-22 |
PL-30 |
PL-30 |
PL-30 |
PL-36 |
PL-36 |
PL-36 |
150,000
(15 gpm) |
NRF-22 |
NRF-33 |
PL-30 |
PL-30 |
PL-36 |
PL-36 |
PL-36 |
PL-55 |
175,000
(17.5 gpm) |
NRF-22 |
NRF-33 |
PL-30 |
PL-30 |
PL-36 |
PL-36 |
PL-36 |
PL-55 |
200,000
(20 gpm) |
NRF-33 |
NRF-33 |
PL-30 |
PL-36 |
PL-36 |
PL-36 |
PL-55 |
PL-55 |
250,000
(25 gpm) |
NRF-33 |
PL-36 |
PL-36 |
PL-36 |
PL-36 |
PL-45 |
PL-55 |
PL-55 |
300,000
(30 gpm) |
NRF-33 |
PL-36 |
PL-36 |
PL-50 |
PL-45 |
PL-130 |
PL-55 |
613 |
400,000
(40 gpm) |
PL-45 |
PL-50 |
PL-75 |
PL-130 |
PL-130 |
605 |
606 |
613 |
500,000
(50 gpm) |
PL-50 |
PL-75 |
PL-130 |
PL-130 |
PL-130 |
608 |
613 |
613 |
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 Selections are based on the following assumptions:
· The radiation is standard baseboard or cast-iron radiators.
· 50% has been added to the total length for fittings, etc.
· The system will operate on a 20°F temperature drop. |
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EXAMPLES OF CALCULATING THE LONGEST
LOOP
The longest loop in
this system is 74'. It starts at the boiler, goes through 3 sections of baseboard, then
goes back to the boiler.
If the pump has enough head to circulate the water through the loop with 3 sections of
baseboard, it can also handle the shorter loop with the single section. |
(Boiler to 1) |
8' |
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(1 to 2) |
30' |
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(2 to 3) |
2' |
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(3 to 4) |
25' |
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(4 to 5) |
7' |
+ (5 to Boiler) |
2' |
Longest loop |
74' |
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The longest loop in
this system is 160'. It starts at the boiler, goes through the 3rd floor radiator at the
top of riser 3, and back to the boiler.
If the pump has enough head to circulate the water through the end of riser 3, then it can
also handle the shorter loops through risers 1 and 2. |
(Boiler to 1) |
2' |
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(1 to 2) |
35' |
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(2 to 3) |
30' |
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(3 to 4) |
10' |
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(4 to 5) |
30' |
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(5 to 6) |
35' |
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(6 to 7) |
8' |
+ (7 to Boiler) |
10' |
Longest loop |
160' |
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