Installation & Operation Manual
6 System piping
Figure 6-7 Double Heater - Single Tank
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| Number of Units |
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Model | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
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| Required Pipe Sizes in NPT |
| ||||
151 | 1 1/2" | 2" | 2" | 2" | 2 1/2" | 3" | 3" |
200 | 1 1/2" | 2" | 2 1/2" | 2 1/2" | 3" | 3" | 4" |
286 | 2" | 2 1/2" | 2 1/2" | 3" | 3" | 4" | 4" |
400 | 2 1/2" | 3" | 3 1/2" | 4" | 4" | 5" | 5" |
501 | 3" | 3 1/2" | 4" | 5" | 5" | 5" | 6" |
601 | 3" | 3 1/2" | 4" | 5" | 5" | 5" | 6" |
701 | 3" | 4" | 5" | 5" | 6" | 6" | 6" |
801 | 3" | 4" | 5" | 6" | 6" | 6" | 6" |
COLD WATER | EXPANSION | |
SUPPLY | ||
TANK | ||
FLOW CHECK |
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VALVE (TYPICAL) |
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BUILDING |
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RETURN |
| |
HOT WATER | MIXING | |
SUPPLY | VALVE | |
THERMOMETER |
| |
TEMPERATURE |
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& PRESSURE |
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RELIEF VALVE |
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WATER HEATER
CIRCULATOR
(TYPICAL)WATER
HEATER (TYPICAL)
UNION (TYPICAL)
BALL VALVE (TYPICAL)
STORAGE 
TANK DRAIN
CAUTION
The piping will not support the weight of the water heater circulator pump. Do not attempt to support the weight of the water heater circulator pump with the piping or its accessories. Refer to the pump manufacturer’s installation instructions. Failure to comply could result in severe personal injury, death, or substantial property damage.
NOTICE
Please note that these illustrations are meant to show system piping concept only, the installer is responsible for all equipment and detailing required by local codes.
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