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BOSCH AquaStar Tankless Propane and Natural
Gas Water Heaters
The BOSCH AquaStar tankless water heaters are redefining how homeowners
throughout North America heat their water.
Tankless hot water heaters provide endless hot water, save energy and save
space.
Sized for most homes and small businesses the BOSCH 125 Series water
heaters supply one major hot water outlet at a time [e.g. One shower running at
a time]. Delivers up to 3.5 gallons per minute.
The revolutionary
hydro-generated ignition system incorporates hydro technology into a domestic
water heating appliance.
How tankless (demand hot water) heaters
work:
1. When you open a hot water tap, cold water enters the heater and triggers the
heating elements or burners. Your hot water tap acts as an ignition key for the
energy used to heat the hot water you need.
2. The water is heated as it flows through the heating elements or heat
exchanger. As the water flow varies, the unit adjusts the heating elements or
burner flame to maintain a constant temperature and maximum energy efficiency.
3. When the hot water tap is turned off, the heating system also turns off.
What you save when using a tankless heater:
Your water heater is the second biggest consumer of energy in your home [after
home heating]. Therefore it is where you can significantly reduce the costs of
your annual energy consumption. Why keep a storage tank full of hot water 24
hours a day when the average household use is less than an hour everyday?
When water is heated in a tank, the inside walls will soon begin to build up
mineral deposits. The scale build up on the bottom of the tank can cause it to
decrease in efficiency by as much as 50% over 10 years and the subsequent
corrosion of the tank's inside wall will eventually cause it to leak.
Bosch The ProTankless™
Gas Water Heaters Specifications
|
|
|
GWH
425 HN |
GWH
425 EF |
|
Technical Specifications |
|
Rated
input (BTU/HR) |
117,000 |
130,000 NG / 125,000 LP |
|
Efficiency |
Thermal |
80% NG
/ 83% LP |
80% NG
/ 82% LP |
|
Energy
Factor |
.85 NG
/ .84 LP |
.78 NG
/ .81 LP |
|
Min.
flow rate (GPM) |
.5 |
.5 |
|
Power
Input (Btu) |
NG |
28,000
- 117,000 |
28,000
- 130,000 |
|
LP |
28,000
- 117,000 |
28,000
- 125,000 |
|
Ignition |
Hydro-Generated* |
Electronic |
|
Modulating Gas Valve |
NA |
Yes |
|
Voltage |
N/A |
120
VAC |
|
Vent
Size |
5" |
4" |
|
Vent
Options |
Conventional Flue |
Power
Vented Through Sidewall |
|
Capacity |
4.25
GPM @ 45°F rise |
4.25
GPM @ 45°F rise |
|
Dimensions (inches) |
Height |
29¾" |
29¾" |
|
Width |
18¼" |
18¼" |
|
Depth |
8¾” |
8¾” |
|
Weight
(lbs) |
40 |
44 |
|
Flow
Rates (GPM) |
|
|
90° F
rise |
2.1 |
2.3 |
|
75° F
rise |
2.4 |
2.7 |
|
65° F
rise |
2.9 |
3.3 |
|
55° F
rise |
3.4 |
3.8 |
|
45° F
rise |
4.2 |
4.6 |
|
Life
Expectancy |
20+
years |
20+
years |
|
Installation Specifications |
|
Gas
Connection |
½"
Male NPT |
½"
Male NPT |
|
Water
Connection |
½"
Male NPT |
½"
Male NPT |
|
NG Gas
Pressure |
Min |
7" WC |
7" WC |
|
Max |
14" WC
|
14" WC
|
|
LP Gas
Pressure |
Min |
11" WC
|
11" WC
|
|
Max |
14" WC
|
14" WC
|
|
Water
Pressure (psi) |
Min |
30 |
18 |
|
Max |
150 |
150 |
|
Electrical Supply |
None |
120
volts/1.2 amps (plugs in) |
|
Vent
Size |
5"
(double-wall type B) |
4"
(single-wall stainless or galvanized) |
|
Optional Accessories |
Power
Vent Kit - AQ1 |
Horizontal Vent Terminator - FXHOOD (FXHOOD required) |
Previous model information:
|
Specs |
125HX |
125FX w FXHood |
|
by Model |
|
Efficiency |
NG: 80%; LP: 83% |
NG: 80%; LP: 82% |
|
@ 55ºF Rise |
3.3 |
3.3 |
|
@ 65ºF Rise |
2.8 |
2.8 |
|
@ 75ºF Rise |
2.4 |
2.4 |
|
@ 90ºF Rise |
2 |
2 |
|
BTU Input |
117,000 |
125,000 |
|
Energy Factor |
0.78 |
0.78 |
|
GPM@ 45ºF |
4 |
4 |
|
Net Weight |
40 lbs. |
44 lbs. |
|
Optional Accessories |
Power Vent |
|
Product Features:
- All water parts are high
quality copper and plastic
- Unit is constructed with
stainless steel and aluminium
- Casing is finished with
baked epoxy
- Heat exchanger is made of
solid copper
- Burners are made of
stainless steel
- Unit has a safety
thermocouple and overheat shutoff protection
- CSA design certified,
Compliant with ASHRAE 90.1
|
Model |
Input (BTU) |
Efficiency |
GPM Flow Rate @ 55°F rise |
Vent Type |
Vent Size |
Ignition System |
Activation Flow in GPM |
Heat Exchanger Warranty |
|
125HX |
117,000 |
82% |
3.3 |
Natural |
5" |
Hydro |
0.5 |
12 Years |
|
125FX |
130,000 |
80% |
3.6 |
Forced |
4" |
Electronic |
|
250SX |
175,000 |
87% |
5.2 |
Direct |
3" |
Electronic |
0.8 |
|
250SXO |
Manufacturer's Warranty:
- 12 years on the heat
exchanger when professionally installed
- Proper product selection
supported by customer service agent
- Proper operation supported
by solar engineer tech assistance
- Toll-Free help line and/or
online e-mail tech support
Product Benefits:
- Endless hot water for the
home or office
- Can reduce energy costs up
to 50%
- Never stores hot water
[preventing rust and leaks]
- High energy factors [cuts
greenhouse gas emissions up to 50% compared to storage tank]
- Steady temperature at
varying flow rates
- Small, light and easy to
install
- Hangs on wall - saving floor
space
- Stores only cold water,
reducing the risk of bacteria growth
- Designed and built to last
20+ years
- 82% efficient for life of
the heater
- Natural gas/propane energy
factor of .69-.84 [tanks .52-.62]
- Electric energy factor of
.99 [tanks .80-.90]
Link to
Bosch web
site
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