Use and Care Manual

Drain Hose
(cold water side)
Hot Water
Service
Valve
Tankless Flush Kit
Flushing Instructions
For Use With Paloma, Rheem, Richmond
and Ruud Tankless Water Heaters
AP14429-2 (07/12)
This kit is designed to flush a tankless water heater for
mineral scale build-up using virgin food grade white
vinegar. Do not use any other flushing solution.
These instructions assume that a set of isolation or
service valves have previously been installed at the
water heater. If there are no service valves present,
then a plumbing professional should be consulted.
1. The entire process can take up to an hour or more to complete.
2. Turn OFF the gas and both the hot at cold water supply to the
tankless water heater. The gas must remain OFF during the
ushing process.
3. To properly ush the heater the electronic bypass valve inside
the heater must be closed. Follow these steps to do this: At
the remote control, turn OFF the power and wait 10 seconds.
Turn ON the power at the remote control, wait 10 seconds,
and disconnect the water heater from the electrical source.
4. Leaving the water OFF to the heater, connect the two drain
hoses, (provided with this kit), to the hose connections on the
service valves under the tankless water heater.
5. Place the loose ends of the hose into a 5 gallon bucket.
6. Open the service port valve on each side, (hot and cold
valves), to allow the heater to drain. Connect the hose for the
cold water side to the outlet of the utility pump and place the
pump on the bottom of the bucket.
7. Pour two gallons of vinegar into the bucket, and plug the pump
into an electrical source.
8. Allow the pump to circulate the vinegar for 45 to 60 minutes.
Depending upon the mineral build up and hardness of the
water some regions may require a longer circulation time.
9. After completing the circulation time, disconnect the power to
the pump and loosen the hose from the pump. Allow the vin-
egar from the heater to drain from the heater into the bucket.
10. Close the service port on the cold water side and disconnect
the hose from the cold side service valve.
11. Remove the hot water side drain hose from the bucket and
route it to a suitable drain, use a second bucket if needed.
Section 1 - Steps to ushing the tankless
This kit includes:
(1) 5 gallon bucket
(1) Utility Pump
(2) Hoses
These Instructions
You will need:
2 gallons, white virgin vinegar
12. Follow the instructions in the Use and Care Manual, (supplied
with the heater), to clean the cold water inlet lter.
13. ONLY turn ON the cold water supply to the heater,
NOTE: DO NOT TURN ON THE HOT WATER SUPPLY TO
THE SYSTEM AS VINEGAR IS STILL IN THE HEATER.
Water will begin to ow through the heater, this will rinse out
any remaining vinegar from the water heater. Allow the water
to run for about 5 minutes to thoroughly out the vinegar.
14. After 5 minutes, close the hot water service port and discon-
nect the drain hose from the hot water side service valve.
15. Open a hot water xture, such as a tub, and turn ON the
hot water supply to the system. Allow the water to ow for a
minute to ensure no air remains in the system, then turn OFF
the xture.
16. Reconnect power to the water heater and turn ON the gas
supply. At the remote control turn on the power to the heater.
17. Run a couple of hot water xtures to ensure the heater is
operating properly.
Tankless
Water
Heater
Cold Water
Service
Valve
Gas Supply
Valve
Utility
Pump
Drain Hose
(hot water side)
5 - Gallon
Bucket
Tankless-Flush-kit-instructions.indd 1 8/10/2012 4:13:00 PM