Rinnai Continuous Flow Water Heaters Operation Manual page 26

Draining your water heater
Line drawing showing the different
connections underneath a continuous flow unit
Hot water
outlet
Water
drain
plug*
Condensate
trap drain plug*
* Condensate trap and water drain plugs—Efficiency
models only.
Wash hands after dealing with condensate
as it is mildly acidic.
3. If required, place bucket under the unit and unscrew the water filter and hot water drain
plug. If you have an Efficiency continuous flow water heater you will also need to unscrew
the condensate trap and water drain plugs.
4. Drain the water heater (can hold up one litre of water) and surrounding pipes.
Re-filling your water heater
1. Check that the gas and power is turned off. Turn off any open hot water tap(s).
2. Insert the condensate trap plug, screw in the water drain plugs and the water filter in the
cold water inlet.
3. Turn on the cold water at the continuous flow water heater.
4. Turn on the hot tap to purge air from the pipe work and unit.
5. Turn off the hot tap.
6. Turn on the gas and power at the continuous flow water heater and turn on any
temperature controllers in the building.
When the water heater or external pipes have frozen
DO NOT operate the water heater if it or the external pipes have frozen. Close the gas and
water valves and turn off the power. Wait until the water thaws, check this by opening the
water supply valve.
Check the water heater and pipes for leaks.
Rinnai New Zealand Ltd
Hot water Water
drain plug filter
Cold water
inlet
Photos highlighting connections that
need to be drained
Continuous Flow Water Heater Operation Manual
26
03-11