English
Installation
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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.
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Install a shutoff 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-off valve ·and clean out sand, debris, air, caulking material, etc. inside the
pipe. Connect to the water inlet, then check water pressure. Close the shutoff
valve and clean the water filter.
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Be sure to put the flow restrictor lever in an upright position like the diagram to
the left. You’ll adjust this as needed seasonally to achieve desired temperatures.
If a water heater is installed in a closed water supply system, such as one having
a backflow 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.
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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:
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Operation of the i12 gas tankless water heater requires a minimum water flow rate of 0.6 GPM to activate and
0.8 GPM to maintain activation.
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Additional water pressure is required for long pipe runs and outlet fitting(s) water pressure drops.
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To maintain proper performance, ensure sufficient 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).
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To supply hot water to upper floors, 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 floor level).
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Well water systems should be set at a range of 50-60 psi.
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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 fittings 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 flexible 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 qualified plumber in accordance with local codes. Use approved plumbing
materials and tools only.
Install a Check Valve between the water heater and the water shutoff valve (See illustration below).
Water Connections
Water Inlet
Flow Restrictor
Filter
Check Valve
Nipple
