AquaStar LP, 125HXNG Features, Unpacking the 125 HX Heater, Principle of Operation

Principle of Operation:

When a hot water faucet is opened, the water flow through the heater causes the gas valve to open. At the same time the hydro-generator activates the electronics which sends a spark to the pilot. The flame sensor confirms the pilot has been lighted and allows the first two burners to come on. The flame sensor confirms correct activation and all burners come on. The pilot goes off. 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 activate the water heater, giving you control over your hot water energy use. Every time you turn off your hot water faucet, the energy consumption of your hot water returns to zero.

FEATURES

-Electronic Pilot Ignition driven by hydro-generator

-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.

-Safety flame sensor at pilot burner.

-Automatic overheating protection shut-off sensor.

-Flue gas safety device.

-Stainless steel burners with stabilized blue flame.

-Built-in corrosion resistant draft diverter.

-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.

-On/Off Switch to activate system.

-Red LED indicator flashes with low water pressure.

-Green LED indicator main burner operation.

BOSCH is constantly improving our products, therefore specifications are subject to change without prior notice.

125 HX LP and 125 HX NG Specifications

Gas Input max.: 117,000 Btu/hr min.: 28,000 Btu/hr

Water Connection ½” 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 43 LB

Net Weight 40 LB

1.8GPM at 90° rise

3.7GPM at 45° rise

Min. Water Flow 1/2 gal/min

LP GAS Supply Pressure

(before 125 HX regulator) min. 11” W.C. max. 14” W.C.*

Required LP GAS Pressure at inlet

tap while 125 HX is operating: 10.5” W.C.

LP GAS Burner Manifold pressure while 125 HX is

operating at maximum input:	9.0” W.C.
Natural Gas Supply Pressure	min.: 7” W.C.
(before 125 HX regulator)	max.: 14” W.C.*
Required Natural Gas Pressure at inlet
tap while 125 HX is operating:	5.7” W.C.

Natural Gas Burner Manifold Pressure while 125 HX is

operating at maximum input: 4.2” W.C.

*Inlet gas pressure before 125 HX regulator must not exceed this value. Pressure may need to be adjusted for high altitudes, see page 9.

UNPACKING THE 125 HX HEATER

This heater is packed securely. The box includes one water connection fitting, a control knob with collar, a gas pressure regulator, a pressure relief valve, an incandescent particle tray, two hooks for hanging the heater, this manual 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.

6 720 606 804 3