On a gas unit, shut off the gas line valve, and disconnect the gas line. Disconnect and remove a section or two of vent pipe. If the unit is electric, you may choose to hire an electrician to disconnect the wiring as volt power can present an electrocution hazard. If you choose to do it yourself, shut off the circuit at the service panel and test to make sure the power is off.
Demand Factor
Disconnect the wires from the unit and remove the old water heater. If you need help with this project, call a local water heater pro.
A new tankless unit can be installed flush—against the drywall or plaster—or set into the wall, between studs. If you want to set the unit into the wall, use a stud finder to locate studs and cut a hole between them. Route water supply pipes to the water heater. Be sure the pipe from the water utility leads to the inlet and the pipe leading to the house is connected to the outlet. Install shutoff valves on both lines near the unit. You also may need to add a pressure-relief valve.
Use union fittings to make the final connections to the inlet and the outlet. Open the water valves but not the electricity or gas.
Open faucets in the house to run water through the unit for a minute or so. Shut off the water valves. Remove the inline filter, usually located near the inlet, and clean out any debris. Cold water enters from one side of the tank, where it is heated by electricity, gas or propane, and hot water exists from the other side.
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- How to Hook Up an Electric Hot Water Tank!
In BC, it's common to install electric hot water heaters while gas is used in Alberta and propane in remote locations. Connecting electric water heaters to the electrical supply is governed by Canadian Electrical Code. A GFCI breaker is not required but most manufacturers do request it as a part of their installation procedure.
If you get a reading, go to the main electrical panel and turn off the correct circuit. This circuit should have been turned off before you removed the old water heater, but double-checking the volt line that powers the water heater can save your life. Move the water heater into position with a hand truck.
Have an assistant help you move the water heater if you're struggling to do it yourself.
How to Install a Tankless Water Heater
Place a level on top of the water heater. Place shims under the water heater to level it out, if needed. Wrap Teflon tape tightly around the threads on the pipes that stick out on top of the water heater the cold water inlet pipe and the hot water outlet pipe. The Teflon tape helps provide a tight seal and prevents leaks from occurring. Connect the water heater to the pipes that carry cold water into the tank and hot water out of the tank, using the provided PEX tubing.
How to Install a Tankless Water Heater
Use the red PEX tubing to connect the hot water outlet pipe on top of the water heater to the line that carries hot water to the faucets in your home, and the blue PEX tubing to connect the cold water inlet pipe on top of the water heater to the line that carries water into the water heater. Close the drain valve at the bottom of the water heater if it's open.
Open all of the hot water taps in your home. Open the valve on the main line that feeds cold water into the water heater.
Electric Water Heater Wiring
Allow the water to fill the tank, then flow out through the hot water line and through the spigots in your home. Allow the water to flow through the spigots for about a minute to bleed air that's trapped inside the lines, and turn off the taps.
Remove the metal plate on top of the water heater that conceals the wiring.