Water Heating Systems

Seisco Tankless Heaters

Electric Water Heaters

Outlet Tube Seal Replacement

The outlet tube seal is located between the outlet tube connection and the left side of the heating chamber. It will be necessary to remove the heater from the wall.

Required Tools:

• Large & small Phillips screw drivers
• battery powered volt meter
• rag, bucket
• two pipe wrenches
• needle nose pliers
• Teflon tape pipe sealer

Warning: To avoid electrical shock, make sure that the all of the power is off to the heater before attempting to remove the old outlet tube seal and while installing the new seal.

1. Turn off all the power to the heater. Confirm the power is off with a voltmeter, even if the status light (or LED) on the control board is off. There may be multiple breakers powering your model heater.
2. Open a hot water faucet nearby. While the water is running, turn off the water supply to the heater. This will help siphon some of the water out of the heater.
3. Using a large Phillips screw driver, remove the six screws from the right bottom clean out plate on the under side of the heating chamber to drain the remaining water from the heater into a bucket. Replace the plate after draining.
4. Using two pipe wrenches, disconnect the inlet and outlet water lines threaded onto the top of the inlet and outlet fittings. Use the rag to prevent any water dripping or spraying, which should be very little if any.
5. Back out the AC power wires through the right side of the metal base pan.
6. Remove the entire heater assembly from the wall by removing the 4 mounting screws.
7. Remove the four Phillips head screws in the back of the assembly that hold the heating chamber to the metal base pan.
8. Remove the four screws that hold the outlet tube to the left side of the chamber assembly, exposing the seal for replacement if necessary.
9. Re-assemble in the reverse order.
10. Wrap the Teflon tape pipe sealer around the threads of the inlet and outlet fittings before reconnecting the inlet and outlet water lines. Do not use Plumber’s Putty or Pipe Dope on the threads of the inlet and outlet fitting connections. If using CPVC or PVC primer and glue, avoid contact of these substances with the inlet and outlet fittings on the heater. These substances are highly corrosive and can damage the inlet and outlet fittings. Leaks may occur as a result and cause severe damage to the heater.
11. Turn on the water and check for leaks.
12. Turn on the power to the heater. Make sure that all of the circuits are on to power the heater.

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