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The maximum operating water pressure is 75 psi (5.17 bar, 517 kPa). If the water pressure is
higher, a pressure regulator must be installed on the main incoming water supply line prior to
installing the electric tankless water heater. The pressure relief valve included with the MODEL
3 is set to 75 psi; therefore, Heatworks does not recommend an incoming water pressure
greater than 75 psi to the MODEL 3.
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Flexible water heater hoses are recommended (minimum of 18” in length) that are easily
detachable, such as braided steel flexible water heater connectors. Standard IEC 60335-2-35,
Clause 7.12.1 requires this appliance be permanently connected to the water main and not
connected by a hose-set. Water heater connection hoses are excluded from this requirement as
long as a new set is used for the installation.
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DO NOT use plastic piping within three feet of heater. Heatworks does not recommend
installing PEX or PVC direct to their products. When installing PEX or PVC piping, please
contact material manufacturer for recommendations/requirements and ensure it is compliant
with your local plumbing codes. Heatworks recommends all the water pipes or hoses within
3’ (1m) of the COLD | INLET and HOT | OUTLET connections be rated for high temperature
applications with a 150°F (66°C) minimum.
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Manual shut-off valves (ball valve) should be installed on the COLD | INLET and HOT | OUTLET
of the water heater.
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Check the pressure of the main water supply. To operate correctly, the heater needs the
operating pressure >30 psi, (2.07 bar), 206.84 kPa.
INSTALLATION INSTRUCTIONS
ALWAYS flush the lines to eliminate all plumbing paste or residue in the lines caused by any
welding or soldering before connecting pipes to the water heater. Failure to flush the lines may
damage the MODEL 3 and void the warranty.
Before proceeding with the installation:
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Flush cold supply line
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Close the main water supply valve
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Open a water faucet to relieve the water pressure and then close the faucet.
STEP 1
Connect the HOT WATER supply line to the water
heater HOT | OUTLET connection at the bottom of
the Brass T fitting, located on the right side of the
heater when facing the unit.
