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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.
INSTALLATION INSTRUCTIONS
STEP 1: Make sure the inlet filter screen is present in the inlet fitting and the inlet and outlet
pipes are correctly aligned with the heater connections to minimize stress on the heater.
CAUTION: Do not over-tighten plastic fittings.
STEP 2: Connect the plumbing to your water heater. The rule of thumb for installing tapered
threaded fittings is finger tight plus 1/2 to 1 turn with a wrench. Do not tighten more than 2 turns
past finger tight. Use 1 1/2 turns of Teflon tape going clockwise around the thread, leaving the
first 2 threads un-covered to avoid contaminating the water flow into the heater.
STEP 3: Fully open the inlet and outlet ball valves. Test with flow and without. Check the system
for water leaks at all plumbing connections. If a leak is present at the NPT threads, slowly tighten
the female NPT fitting up to 2 turns past finger tight. If still leaking, remove female NPT to check
for damage or contamination. Replace Teflon tape before threading NPT back on.
1. Do not solder any pipes with 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 Massachu-
setts 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. 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.
PLUMBING REQUIREMENTS:
Minimum turn on flow rate 0.3 GPM
Minimum working pressure 30-150 PSI
Optimal operating pressure 35-80 PSI
Boiler drains (may be beneficial)
INSTALLATION REQUIREMENTS:
Use ½" and ¾" NPT fittings for install
12kW units have ½" fittings
18kW & 27kW units have ¾" fittings
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