EcoSmart POU 4T Installation Instructions & Owner's Manual page 5

4- PLUMBING INSTALLATION
Please follow all plumbing instructions carefully. We recommend that this product be installed by a licensed and
qualified plumber in accordance with all applicable national, state, provincial, and local plumbing codes.
This water heater is supplied with ½" NPT fittings, DO NOT weld or use paste.
STEP 1: Thoroughly flush cold supply line of debris and connect the HOT WATER line to the water heater OUTLET
located on the left side of the heater when facing unit. Connect the COLD WATER line to the water heater
marked COLD WATER INLET on the right side when facing unit.
STEP 2: After tightening both fittings at the water heater, open several hot water faucets and allow water to run
though the water heater for at least 2 to 3 minutes. This process purges all the air from the water lines and
MUST be performed prior to turning on the power at the unit. FAILURE TO FOLLOW THIS STEP CAN CAUSE
PERMANENT DAMAGE TO THE HEATING ELEMENTS. If any maintenance is performed on the water heater or the
home's plumbing system that may introduce air into the plumbing pipes, it is important to turn the power off to
the water heater and purge the air out of the lines before allowing the unit to power up.
STEP 3: Carefully inspect all connections, unions, and the pressure relief valve (if installed) for leaks.
IMPORTANT NOTES:
1. Do not solder any pipes with the unit connected to pipes – heat from soldering may damage the flow
sensor. Doing so will void the warranty.
2. This automatic tankless water heater is equipped with both computer-controlled and electro-
mechanical auto resetting thermostat switches for high-limited temperature protection. Since this
product does not use a storage tank, the use of a temperature pressure relief valve (T&P) is not required
for most installations. UL Standard 499 does NOT require that a pressure relief valve be used. However,
a T&P valve may be required to meet installation codes in your area. If one is required, install the
pressure relief valve in accordance with local codes and ensure that it operates correctly and that air is
purged from the valve prior to installing the water heater. When connecting to Flex or High
Temperature CPVC pipe, we recommend that a T&P valve be used for added safety.
Please note: Installations in the Commonwealth of Massachusetts and State of Kentucky require a
pressure relief valve. Please check your local installation codes for any special requirements.
3. The maximum operating water pressure is 150 PSI (1035 kPa). If the water pressure is higher, a pressure
reducing valve must be installed on the main incoming water supply line prior to installing the electric
tankless water heater.
4. Flexible water heater hoses are recommended to be used with your water heater as part of the
installation. When connecting the inlet water pipe to the unit, make sure to use a wrench to hold the
unit's connection, and another wrench to tighten, so that the flow sensor on the unit will not be
loosened or damaged. Serious internal damage to the water heater can occur if the inlet or outlet
connections are over tightened or if solder connections were made.
5. We recommend that a manual shut-off valve (ball valve) is installed on the inlet and outlet of the water
heater so that there is a convenient shut-off point available in the event that future maintenance or
servicing is required. It is extremely important to 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.
We recommend that all the water pipes or hoses within 3' (1m) of the inlet and outlet connections be rated for
high temperature applications with a 150°F (66°C) minimum.
WARNING CHECK FOR LEAKS BEFORE PROCEEDING TO ELECTRICAL INSTALLATION
Installation Instructions
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