** -X represents the number of coils required. Please note the Max number of coils/ tank.
Solar Example
300 gallon tank designed to preheat domestic water to 100 degrees
with a boiler back-up to raise the water temperature from
100 degrees to 140 degrees.
From the solar collector - 110 degrees
Delta T - 20 degrees
Incoming water temperature - 50 degrees
Outlet temperature - 140 degrees
1 - coil as Boiler back up
3 - coils from the solar collectors
8.7 gallons continuous draw
700 gallons first hour rating
Solar Coils
74,666 btu's
67,200 btu's
74,666 btu's
Total - 216,533 btu's/hr
7.6 min flow rate
Boiler back-up coil:
From the boiler - 180 degrees
Inlet water temperature - 100 degrees
Outlet water temperature - 140 degrees
5.9 continuous draw
533 First hour rating
117,629 btu's
11.9 min flow rate
Boiler Example
300 gallon tank designed to heat domestic water to 140 degrees
