Installation Instructions

whl-590 Rev. 003 Rel. 003 Date 3.22.18
21
COLD WATER INLET
HOT WATER OUTLET
Figure 11 - Water Heater with Storage Tank - NOTE: There is a Built-In Flow Check in the Internal Pump Loop
NOTES:
1. Minimum pipe size should match connection size. Upsize pipe accordingly if greater ow is required.
2. A thermal expansion tank suitable for potable water must be sized and installed within this piping system between the backow preventer
and the cold water inlet.
3. All circulators should have an integral ow check.
4. Drains and check valve between water heater and piping will assist in purging air from system.
5. These drawings are meant to demonstrate system piping only. The installer is responsible for all equipment and detailing required by local
codes. In Massachusetts, you must install a vacuum relief valve per 248 CMR.
6. Mixing valve application is optional, but recommended to help prevent scalding.
7. Always shut o power to the water heater or isolate the heater from the system if ANY plumbing work is to be done. Running the water
heater without water will result in dry-ring.
8. When using unit with storage tank, the setpoint of the water heater needs to be at least 20
o
F higher than the setpoint of the Aquastat on
the tank. Pump selection must meet a minimum ow rate requirement of 2 GPM.
NOTE: These drawings are meant to show system piping concept only. Installer is responsible for all equipment and detailing required by
local codes.
COLD WATER INLET
HOT WATER OUTLET
Figure 12 - Water Heater with Storage Tank and Recirculation - NOTE: There is a Built-In Flow Check in the Internal Recirculation Pump Loop