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| GWH 635 ES Technical Support |
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| Technical Specifications |
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| Technical Specifications |
| Power Input |
NG: 35,000 - 175,000 Btu
LP: 31,000 - 175,000 Btu |
Minimum Flow
Rate to Activate |
.8 gallons per minute (gpm) |
| Flow Rates |
90° F rise / 3.2 gpm
75° F rise / 3.9 gpm
65° F rise / 4.5 gpm
55° F rise / 5.2 gpm
45° F rise / 6.4 gpm |
| Energy Factor |
.80 |
| Thermal Efficiency |
87% (recovery efficiency) |
| Dimensions |
23½”h x 15¾”w x 8½”d |
| Weight |
47 lbs. (21 kg) |
| Ignition |
Electronic |
| Life Expectancy |
20+ years |
| Optional Accessories |
Wireless Remote control |
| Installation Specifications |
| Gas Connection |
¾" Male NPT |
| Water Connection |
¾" Male NPT |
| LP Gas Pressure |
Minimum: 11" WC
Maximum: 14 " WC |
| NG Gas Pressure |
Minimum: 5" WC
Maximum: 14 " WC |
| Water Pressure |
Minimum: 30 PSI
Maximum: 150 PSI |
| Electrical Supply |
120 VAC 50/60 Hz
Idle 40mA, Operation ≤ 2.5A | Warning: Do not mount heater directly onto vinyl siding. A 6' x 4' area of vinyl siding must first be covered or replaced with wood or other non-plastic material.
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| High Altitude Operation |
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| Altitude |
Natural
Gas |
Liquid
Propane |
Special
Notes |
0 - 4,000 ft
(0-1,219 m) |
no
modification |
no
modification |
For operation at elevations above 2,000 ft (610 m) the equipment ratings shall be reduced at the rate of 4% for each 1,000 ft (305 m) above sea level. |
4,000 ft - 7,000 ft
(1,219m-2,134m) |
CO2 adjustment with flue gas analyzer required
Refer to this tech bulletin. |
Above 7,000 ft
(above 2,134 m) |
Not approved |
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