Natco Fire-Coil Volume Water Heaters
Page 11
Hot Water
Return from
Building
Throttling
Valve
Check
Valve
Bldg.
Loop
Circ.
Pump
Hot Water
to Building
Cold
Water
Optional Cold Water Supply
When Adequate Tank Opening
Not Available
To
Drain
Heater
Service
Valve
Pump
To Drain
Conventional
Tank
Figure 21. Hot water supply with horizontal tank.
Note:
Heavy line
indicates heater-to-tank circulation loop.
Hot Water
Return from
Building
Hot Water
to Building
Check
Valve
Bldg.
Loop
Circ.
Pump
Cold
Water
24-Inch
Min.
Drain
Conventional
Tank
Heater
To
Drain
Service
Valves
Figure 20. Hot water supply with vertical tank.
