Operating Guide

16
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To conserve energy and to prevent freezing, insulate both cold
and hot water supply lines. DO NOT cover the drain valves.
Install a shuto valve near the inlet of the water heater for service
and draining purposes. Before connecting the water supply pipe to
the water heater, open the shut-o valve ·and clean out sand, debris,
air, caulking material, etc. inside the pipe. Connect to the water
inlet, then check water pressure. Close the shuto valve and clean the
water lter.
If a water heater is installed in a closed water supply system, such as
one having a backow preventer in the cold-water supply line, means
shall be provided to control thermal expansion. Contact the water
supplier or local plumbing inspector on how to control this situation.
CAUTION: This water heater must only be used with the following water supply system conditions:
• With clean, potable water free of corrosive chemicals, sand, dirt, or other contaminates.
• With inlet water temperatures above 32°F, but not to exceed 120°F.
• Free of lime and scale deposits.
• DO NOT reverse the hot and cold water connections. The water heater will not operate.
To ensure proper operation of the water heater, the following water pressure guidelines should
be followed:
• Operation of the i12 gas tankless water heater requires a minimum water ow rate of 0.6 GPM to activate and
0.8 GPM to maintain activation.
• Additional water pressure is required for long pipe runs and outlet tting(s) water pressure drops.
• To maintain proper performance, ensure sucient water supply pressure. The Required Water Flow Rate =
Min. Operating Water Pressure (0.8 GPM) + Pipe Pressure Loss + Faucet and Shower Pressure Loss + Safety
Margin (more than 5 psi).
• To supply hot water to upper oors, additional water pressure (0.44 psi/ft) must be ensured. The measurement
should be calculated by the distance between the water inlet of the water heater (ground level) to the hot
water faucet (upper oor level).
• Well water systems should be set at a range of 50-60 psi.
• When the water is supplied from a water supply tank, the height of the tank and the diameter of the pipes
and their relation to water pressure, should be taken into consideration. Gravity water pressure is not
recommended.
IMPORTANT: Do not apply heat to the HOT or COLD water connections. Any heat applied to the water
supply ttings will permanently damage the internal components of the water heater.
NOTICE: If the water pressure resistance of a shower head is too high, the burner in the water heater will fail to
ignite. Keep the shower head clean from debris that could cause additional pressure drop.
Notice: If using mixing valves on the outlet, choose one which prevents cold water pressure from overcoming hot
water line pressure.
DO NOT use pipes with smaller diameters than the water supply connection of the water heater.
Be sure to connect the water inlet and the hot water outlet as shown on the water heater. If reversed, the water
heater will not function.
Installation of unions or exible copper connections are recommended on the HOT and COLD water lines, so that
the water heater may disconnect easily for servicing if necessary.
Plumbing should be carried out by a qualied plumber in accordance with local codes. Use approved plumbing
materials and tools only.
Install a Check Valve between the water heater and the water shuto valve (See illustration below).
Water Connections
Installation