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5. Install a shut-off valve in the cold water inlet line. It
should be located close to the water heater and be easily
accessible. The owner/operator must be shown the
location of this valve and be given instructions on how to
use it to shut off the water to the heater.
Note:
Rear and Combination flue heaters are equipped with
a combination cold water inlet/drain valve.
COLD WATER
SHUT-OFF
AQUASTAT
TEMPERATURE
CONTROL
T&P VALVE
DRIP TUBE
DRAIN
VALVE
HOT WATER
OUTLET
6 ”
CENTER
OF BLAST
TUBE
NON-COMBUSTIBLE
FLOOR
TOP
NIPPLE
BREECH
CONNECTION
Figure 9. Plumbing Connections (Center Flue)
Please note the following:
DO NOT install this water heater with iron piping. The system
should be installed only with piping that is suitable for potable
(drinkable) water such as copper, or PEX.
DO NOT use PVC water piping.
DO NOT use any pumps, valves, or fittings that are not
compatible with potable water.
DO NOT use valves that may cause excessive restriction to
water flow. Use full flow ball or gate valves only.
DO NOT use any lead based solder in potable water lines.
Use appropriate tin-antimony or other equivalent material.
DO NOT tamper with the aquastat, burner or temperature
and pressure relief valve. Tampering voids all warranties.
Only qualified service technicians should service these
components.
DO NOT use with piping that has been treated with chromates,
boiler seal, or other chemicals.
DO NOT add any chemicals to the system piping which will
contaminate the potable water supply.
This unit must NEVER be connected to any existing heating
system or component(s) previously used with a non-
potable water heating appliance. All models are suitable for
combination potable water and space heating applications.
COLD WATER
SHUT-OFF
AQUASTAT
TEMPERATURE
CONTROL
LOCATION
T&P VALVE
COLD INLET
AND DRAIN
VALVE
COMBINATION
HOT WATER
OUTLET
6 "
CENTER OF
BLAST TUBE
NON-
COMBUSTIBLE
FLOOR
Figure 10. Plumbing Connections (Center/Rear Flue)
Mixing Valves
Water heaters are intended to produce hot water. Water
heated to a temperature which satisfies space heating, clothes
washing, dish washing, and other sanitizing needs can scald
and cause permanent injury upon contact. Short repeated
heating cycles caused by small hot-water uses can cause
temperatures at the point of use to exceed the water heater’s
temperature setting by up to 20F° .
Some people are more likely to be permanently injured by
hot water than others. These include the elderly, children, the
infirm and the physically/mentally disabled. Table 3 shows the
approximate time-to-burn relationship for normal adult skin.
National plumbing code requirements limit the temperatures of
certain fixtures in the home. Local codes may have additional
requirements. In addition to these requirements, if anyone
using hot water in your home fits into one of these groups,
then you must take special precautions. In addition to using
the lowest possible temperature setting that satisfies your
hot water needs, a means such as a Mixing Valve, should
be used at the hot water taps used by these people or at the
water heater. Mixing valves are available at plumbing supply
or hardware stores. Consult a Qualified Installer or Service
Agency. Follow mixing valve manufacturer’s instructions for
