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The AquaStar 125 water heater contains a flow
restrictor set at 3 1/4 gpm. Its purpose is to as-
sure that the hot water temperature will always
be within a comfortable range regardless of how
high one may turn on the hot water faucet or how
many faucets may be turned on. Your AquaStar
model 125 also has an automatic thermostatic
control with a manual temperature setting (Fig. 2
letter H p. 6). For energy efficient operation, we
recommend operating this heater at the lowest
temperature which you require in your applica-
tion. This will provide a more consistent tempera-
ture over a wider range of flow. Lower tempera-
ture settings help prevent temperature fluctuations
that may occur when other water outlets are used
simultaneously or overall water pressure changes
or excessive cold water has to be added. In hard
water areas, reducing the water temperature
greatly reduces the potential for mineral scale
build-up in the heat exchanger.
What is the best temperature setting?
Because AquaStar water heaters can deliver
endless hot water at the exact temperature which
you have selected, there is no need to set it for
very hot water and then mix in cold. It just doesn't
make sense to overheat water then mix in a lot
Approximately once a year, the AquaStar should
be checked, cleaned and serviced as necessary.
The following operations must be performed by
a qualified service person:
Vent System: Should be checked annually.
Clean and repair as needed.
Water Valve (Part #34343): The water valve on
this heater should be serviced periodically de-
pending on hardness of water and conditions of
use or whenever signs of corrosion appear at the
gas and water valve joint. Servicing the water
valve consists of replacing the Push Rod Assem-
bly (part #21107), the Diaphragm (part# 32570),
and the Water Valve Spring Loaded Piston (part
#34542).
SETTING THE WATER TEMPERATURE
of cold water to cool it off. Remember you can-
not run out of hot water with an AquaStar, so set
the dial for the (exact) temperature that you need.
for a hot bath. The temperature you select will
hold over a range of water flow rates. (See chart,
Fig. 6, page 18). You may further vary the tem-
perature by signficantly changing the flow rate,
particularly at the highest temperature settings.
Position "5" on the temperature dial is the pre-
ferred starting point for setting the temperature
control. This setting provides approximately
130ºF depending on the flow rate.
Positions "2" and "3" provide approximately
105ºF, adequate for a shower depending on flow
rate.
Positions "4" through "6" are intermediate set-
tings between warm and very hot.
Position "8" allows for the hottest temperature of
about 150ºF up to about 1.8 gallons per minute.
WARNING:150º can cause third degree burn.
MAINTENANCE AND SERVICE
Drainage: Drain the heater if there is any dan-
ger of freezing. Shut off the water supply, open
all hot water faucets, and disconnect the lowest
AquaStar fittings and the connections to the wa-
ter valve (Fig 2, (R), page 6). Loosen the 2 re-
taining screws at the connection to the gas valve
and rotate the water valve 360
water. The pressure-temperature relief valve op-
eration should be checked. Perform a manual
operation of this valve at least once a year en-
suring that a drain is nearby to receive any dis-
charge (see section 5, page 10). Take precau-
tions to avoid contact with hot water coming out
of discharge opening and to prevent water dam-
age. Do not plug the relief valve. If the relief
12
Note: 105ºF is the maximum recommended
model "S" version heater. The model "S"
is a specifically modified AquaStar which will
not overheat if inlet water is already hot.
o
to empty all the
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