lp-672 Rev. 000 Rel. 002 Date 10.3.18
20
HOT WATER OUTLET
COLD WATER INLET
HOT WATER OUTLET
COLD WATER INLET
RECIRCULATION
Figure 13 - 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 flow is required.
2. A thermal expansion tank suitable for potable water must be sized and installed within this piping system between the backflow preventer and the cold
water inlet.
3. All circulators should have an integral flow 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 off 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-firing.
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 flow 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.
NOTE:
Pumps must either be installed indoors or be rated for outdoor installations. This statement does not apply to the built-in pump.
HOT WATER OUTLET
COLD WATER INLET
RECIRCULATION
COLD WATER INLET
HOT WATER OUTLET
Figure 14 - Water Heater with Storage Tank and Recirculation - NOTE: There is a Built-In Flow Check in the Internal Recirculation Pump Loop
