Rheem MPi 551 Series Owner's Manual And Installation Instructions page 35

26. Water Connections: Connect the cold water supply and the hot water pipe work to the water heater.
Connect the temperature pressure relief valve and its drain line.

Refer to "Connections – Plumbing"
Water Supply: Turn on the cold water supply and fill the water heater.
27.
Check the pipe work and the connection points for the flexible braided hoses for leaks

Refer to "To Fill And Turn On The Water Heater"
not be turned on at this stage.
Heat Pump Module Cover: Replace the heat pump module cover and re-fit the two screws.
28.
Commissioning: Refer to
29.
on page 36.
Step 28
replace heat pump module front cover
"Commissioning" on page 40.
35
HEAT PUMP AND TANK ASSEMBLY
on page 40, however the electrical supply should