AquaStar 125B NGS specifications Features, Unpacking the Aquastar Heater

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

1.8GPM at 90° rise

3.7GPM 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.

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