Here is a Classic Heat Pump charging a Buffer Tank connection scheme as a guideline for the Mechanical, Installer, and HVAC trades.


IMPORTANT!


  • Always calculate room-by-room Heat Loss and use a Equipment Sizing form, it is the installers responsibility.

  • The Buffer tank should be a minimum of 50 gal for a 5 kW, 80 gal for a 7 kW and higher. A guide is 10 gal/1kW.
    Buffer tanks must have a 6 kW electric element as backup, should an unexpected weather or service event happen.


  • Allow for 2.5 Gallons Per Minute as a flow rate per 12,000 BTU Heating Capacity. A 7kW(24,000 BTU) needs 5 GPM.


  • Install SunPump indoors in fully conditioned space. A garage with a heater is not fully conditioned space, per BC Code.


  • Heat Traps are required by Code. Make sure to start hot water pipes down 6 inches before going up, or use Heat Trap valves on vertical pipes. Pumps within close proximity may qualify if a spring check valve is part of the pump to prevent thermal-siphoning.


  • Allow not less than 24 inches of room for servicing along the left, front, and right sides. It is a violation to limit service access.


  • Complete and send the HVAC Commissioning PDF form to SunPump to validate the Warranty. 


SunPump offers a low cost Mechanical Design Service for custom building schemes on our website.