27
Water Supply Connection
The water fittings on the Eternal water heater are 3/4" NPT.
Although Eternal's water connections are 3/4", if the installation site has only 1/2" plumbing throughout the
building, it is not necesssary to up size the water lines to 3/4" when installing a single unit.
When installing more than one unit to supply higher volumes of hot water in residential applications, the number
of Eternal water heaters required and the header pipe sizing needs to be properly sized to meet the total hot
water demand.
All pipes, pipe fittings, valves and other components including solder, must be approved for use in potable water systems.
The use of unions and material shut off valves on both the cold water inlet and hot water outlet is recommended.
The use of brass stainless steel or copper unions/nipples is recommebded for use with an Eternal water heater.
Take measures to prevent water pipe from freezing is important. In the event of frozen water pipe, Eternal will
not able to activate freeze protection function due to lose of water pressure and will be susceptible to freeze and
cause serious unit damage.
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WATER SUPPLY CONNECT
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Close water supply shut-off valve to the unit first.
Connect garden hose to the draining valve located on the lower leftsider of the unit.
Open the valve by using a flat head screw driver to drain water with the hose.
After draining the tank, turn the valve body to remove the draining valve from the unit and clean the filter.
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FILLING THE WATER
DRAINING THE WATER
Close the water heater drain valve by turning the knob to the right. The drain valve is on the lower leftside of the
water heater.
Open the cold water supply valve to the water heater.
To ensure complete filling of the tank, allow air to purge by opening the nearest hot water faucet. Allow water to
run until a constant flow is obtained.
Check all new water piping for leaks. Repair as needed.
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Eternal is designed for full flow with low pressure loss. Without flow restriction, if Eternal is overdrawn due to demand
exceeding unit(s)’s BTU recovery capacity, outlet temperature will not reach set point. However, full flow without
diminished hot water pressure will continue to be delivered. It is important to make sure each job is properly sized to
ensure hot water demand can be satisfied.
Be careful not to reverse the hot water outlet and cold water supply line connections to the water heater. This will caused
your water heater to operate dangerously and void warranty. Make sure the hot and cold lines are connected properly.
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WARNING
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Never use this water heater unless it is completely filled with water.
Be certain there are no loose particles or dirt in the piping. Keep a copper pipe diameter at NPT 3/4 inch
diameter to allow full flow. If the hot and cold connections are reversed, the heater will not work properly and
could damage the unit. Be sure to connect them correctly.
If water flow is low, check the fitter by removing the draining valve.
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CAUTION
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CAUTION
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Do not open the draining valve without connecting a hose so that water can be diverted to an area where water
damage is not a problem. Do not remove the draining valve from the unit without first draining the tank.
The use of galvanized or dielectric unions is prohibited for use with an Eternal water heater. Fail to comply with this
warning will void warranty.
WARNING
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