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This well engineered, gas water heater has been specially
designed to operate with incoming pre-heated water:
It operates on the principle of heating water instantaneously
“on demand”. When a hot water faucet is opened, cold water
flows through the coils of the heat exchanger in the Aquastar.
This same flow opens the gas valve, and the burners are
ignited by the pilot flame. The heat exchanger coils absorb
the heat generated by the burners and transfer heat to the
water. When the hot water faucet is shut off, the gas valve
automatically closes and the burners turn off. Your hot water
faucet is an ignition key to turn on the water heater, giving
you control over your hot water energy use. Each time you
turn off your hot water faucet, you also shut off the water
heater. On the Aquastar “S” model, if the incoming water is
colder than the thermostat setting of the heater, the burners
will ignite to heat the water in order to boost it and maintain
it at the temperature setting. If the incoming water has been
pre-heated, (ie) solar, and this water temperature is warm
then the the burners will modulate down accordingly, or
shut down completely if the temperature is as hot or hotter
than the heater thermostat setting. The Aquastar 125 BS is
the perfect backup to a solar hot water system.
FEATURES
- High Quality Materials for Long Working Life.
- Copper heating coils for endless supply of hot water.
- Burner output proportional to hot water flow demand for
maximum energy efficiency.
- Automatic Thermostatic Control for steady hot water
temperature
- Input BTU’s modulate to zero to prevent overheating of
water from pre-heat source
- Safety thermocouple at pilot burner.
- Automatic overheating protection shut-off sensor.
- Stainless steel burners with stabilized blue flame.
- Built-in corrosion resistant draft inducer.
- Compact space saver: mounts on a wall with two hooks.
- Easily removable one-piece cover.
- Easy one person installation.
- Adjustable water flow restrictor to ensure that water flow
demand will not exceed the heating capacity of the heater.
- Easy pilot flame lighting with push button piezo ignition.
BOSCH is constantly improving our products, therefore
specifications are subject to change without prior notice.
AquaStar 125B LPS and 125B NGS Specifications
Gas Input max.: 117,000 Btu/hr
min.: 23,400 Btu/hr
Water Connection 1/2” Thread fitting NPT
H x W x D 29 3/4” x 18 1/4” x 8 3/4"
Vent 5”
Gas Connection 1/2” NPT thread
Min. Water Pressure 18 Psi at 4 GPM
Max. Water Pressure 150 Psi
Shipping Weight 44 LB
Net Weight 42 LB
1.8 GPM at 90° rise
3.7 GPM at 45° rise
Min. Water Flow 1/2 gal/min
LP GAS Supply Pressure
(before Aquastar regulator) min.: 11” W.C.
max.: 14” W.C.*
Required LP GAS Pressure at inlet
tap while Aquastar is operating: 10.5” W.C.
LP GAS Burner Manifold pressure while Aquastar
is operating at maximum input: 9.0” W.C.
Natural Gas Supply Pressure
(before Aquastar regulator) min.: 7” W.C.
max.: 14” W.C.*
Required Natural Gas Pressure at inlet tap
while Aquastar is operating: 5.7” W.C.
Natural Gas Burner Manifold pressure while Aquastar is
operating at maximum input: 4.2” W.C.
* Inlet gas pressure before Aquastar regulator must not
exceed this value. Pressure may need to be adjusted for
high altitudes, see page 11.
UNPACKING THE AQUASTAR HEATER
This heater is packed securely. The box includes two water
connection fittings, a gas pressure regulator, a pressure relief
valve, an incandescent particle tray, two hooks for hanging
the heater, this manual, a warranty statement and a warranty
registration card. Do not lose this manual, as there is a
charge for replacement. Please complete and return the
enclosed warranty registration card.