Bosch Appliances Water Heater W125K User Manual

Instantaneous gas water heater  
Models  
W 125...T1  
• installation  
• operation  
• maintenance  
The Bosch instantaneous water heater is a high efficiency,  
space saving answer to your water heating needs. All  
Bosch instantaneous water heaters heat water only as  
required; no energy is lost maintaining a large volume of  
water at elevated temperatures as in tank-type storage  
water heaters.  
Suitable for heating potable water only – not approved  
for space heating purposes.  
READ INSTRUCTIONS CAREFULLY BEFORE INSTALLING  
WARNING: If the information in this  
manual is not followed exactly, a fire or  
explosion may result causing property  
damage, personal injury or death.  
NOTICE TO INSTALLER: Please leave this  
manual with the owner or affix adjacent to  
appliance.  
- Do not store or use gasoline or other flamma-  
ble vapors and liquids in the vicinity of this or  
any other applicance.  
- WHAT TO DO IF YOU SMELL GAS  
• Do not try to light any appliance.  
• Do not touch any electrical switch; do not  
use any phone in your building.  
• Immediately call your gas supplier from a  
neighbor’s phone. Follow the gas supplier’s  
instructions.  
ASTRAVAN DISTRIBUTORS, LTD.  
123 Charles Street  
North Vancouver, B.C. V7H 1S1  
Phone Canada: (604) 929-5488  
• If you cannot reach your gas supplier, call  
the fire department.  
Phone USA:  
(206) 860-8448  
- Installation and service must be performed by  
a qualified installer, service agency or the gas  
supplier.  
Note: In case of problems please contact your salesman or installer  
 
FORWARD  
This design complies with CAN 1-4.3-77 and ANS1 The BOSCH instantaneous gas water heater is designed to  
Z21.10.3b 1994 as an instantaneous gas water heater. In operate on natural or propane gas; however, make sure that  
addition the unit complies with CAN1-2.17-M80 for use at gas on which heater is to operate is the same as specified  
high altitude, 2.000-4.5000 feet above sea level.  
on the heater’s model/rating plate.  
Instalation, operation and maitenance information is provided In addition to these instrutions,the water heater shall be  
in this manual. Installation and operation instructions should installed in accordance with CAN1-B149 Installation Code  
be thoroughly reviewed before proceeding with installation (in Canada) or ANSI Z223-1/NFFA 54 National Fuel Gas  
of the BOSCH instantaneous gas water heater.  
Code (in U.S.) and/ or local installation cades. These shall  
be carefully followed in all cases.  
INSTALLATION INSTRUCTIONS  
Note: Proper plumbing, venting, gas connections and an In unconfined spaces, in buildings of normal construction,  
adequate supply of combustion air are required for infiltration normally is adequate to provide air for combustion,  
safe and reliable operation. Ability equivalent to that ventilation and dilution of flue gases. However, a confined  
of a licensed tradesman in the field involved is required space must be provided with two permanent openings to  
for installation and/or servicing of these water heaters. provide combustion and ventilation air to the appliance. Each  
opening shall have a free area of on square inch per 1,000  
Btu/hr of total input rating of all the appliances in the  
LOCATION  
enclosure, but not less than 100 square inches. One opening  
Before installing the BOSCH instantaneous gas water shall be within 12 inches of the top and one within 12 inches  
heater consideration must be given to proper location. The of the bottom of the enclosure.  
BOSCH W125K... instantaneous gas water heater may be  
installed to supply hot water to remote locations. Location For either a confined or unconfined space in a building of  
should be as close to a chimney or gas vent as practical, in tight construction, with inadequate infiltration, air must be  
an area with an adequate air supply and as centralized with drawn from the outdoors or from spaces that freely  
the piping system as possible. The heater should not be communicate with the outdoors. Two permanent openings  
located in an area where it will be subject to freezing. The located as indicated above are to be provided as follows:  
heater should be located in an area where leakage of the  
heater or its connections will not result in damage to the 1. When communicating with outdoors directly, or by  
area adjacent to the heater or to lower floors of the structure.  
means of vertical ducts, each opening shall have a free  
area of not less than one square inch per 4,000 Btu/hr of  
total input of all appliances in the space.  
Note: When such locations can not be avoided, it is  
recommended that a suitable drain pan, adequately  
drained, be installed under the heater. The pan must 2. When communicating with outdoors by means of  
not restrict combustion air flow. horizontal ducts, each opening shall have a free area  
of not less than one square inch per 2,000 Btu/hr of total  
input of all appliances in the space.  
AIR REQUIREMENTS  
For safe operation, sufficient air for combustion, ventilation  
and dilution of flue gases must be available. An insufficient  
supply of air will result in a yellow luminous burner flame,  
causing carboning or sooting of the heat exchanger.  
3
 
WARNING  
1. Flammable materials, gasoline, pressurized containers,  
or any other items or articles that are potentially fire  
hazards must never be placed on or adjacent to the  
heater. The appliance area must be kept free of all  
combustible materials, gasoline and other flammable  
vapors and liquids.  
2. Do not obstruct the flow of combustion and ventilation  
air to the appliance.  
CLEARANCES  
This heather is designed certified for installation on a  
combustible wall, in an alcove with minimum clearances to  
combustible construction of 51mm (2 inches) from sides,  
305mm (12 inches) from top and bottom. A minimum of  
305mm (12 inches) shall be allowed for maintenance of  
serviceable parts. Clearance from vent is dependent upon  
the clearance rating of the venting material used; that is  
type B-1 vent is approved for 1 inch clearance, B-2 vent for  
2 inch, etc.  
Figure 2  
RELIEF VALVE  
The listed pressure relief valve supplied must be installed  
near the hot water outlet at time of installation of the  
heater. No valve is to be placed between the relief valve  
and the heater. A drain line must be connected to the  
relief valve to direct discharge to a safe location. Do not  
install reducing coupling or any other restriction in the  
discharge line. The discharge line must be installed so  
as to allow complete  
MOUNTING  
The W125K…is designed certified for mounting to a wall.  
The heather must not be installed directly on a carpeted  
wall.  
The heather must be mounted to the wall using appropriate  
anchoring materials, through the four holes provided.  
drainage of both the valve and the line.  
GAS CONNECTIONS  
Expansion and contraction of piping due to changing water  
temperature in pipes imparts movement to heater which, if  
mounted directly to a brittle, board such as plasterboard  
can cause failure of mounting.  
Before connecting the gas supply to the heater check  
heater’s model/rating plate to make sure that gas on which  
heater is to operate is the same as specified on the model/  
rating plate.  
Heater must be mounted level to assure proper operation.  
The W125K…instantaneous gas water heater is supplied  
with a gas pipe, a gas pressure regulator and a manual gas  
cock that must be installed on the heater before attaching  
the gas supply line, see figure 3. Failure to install gas pipe,  
the main manual gas valve and the pressure regulator, or  
the failure to install them in the sequence show in figure 3  
will be in violation of the A.G.A. and C.G.A. certification of  
the unit and can cause damage to heat changer.  
VENTING  
The BOSCH model W125K… instantaneous gas water  
heater has a built-in a draft diverter is designed for indoor  
installation only. The draft diverter outlet must be connected  
to a clear, unobstructed vent of the same size or larger, refer  
to:  
-
-
-
In Canada, CAN 1-B149 Installation Code for detailed  
requirements  
In U.S., ANZI Z223.I/NFPA 54 National Fuel Gas Code  
for detailed requirements  
The minimum length of a vertical vent up to the terminal  
must be 2 ½ feet.  
BOSCH water heaters are shipped from the factory with  
the gas pressure regulators preset for the gas shown on the  
rating plate to the correct pressure.  
-
-
In Canada, for high altitude operation;  
In U.S., for standard altitude operation unless specially  
marked as a high altitude unit.  
WATER CONNECTIONS  
The W125K comes supplied with a ½’’ NPT cold water inlet  
adapter and a flexible wire braid hot water outlet with a ½’’  
NPT connection.  
4
 
Check to make sure that the gas listed on the rating plate is  
same as gas listed on the pressure regulator. See PRESSURE  
REGULATION section of this manual for information  
regarding gas pressure settings.  
PROPANE SUPPLY  
Note: Before attaching the gas supply line, be sure that all  
gas pipe is clean on the inside. To trap any dirt or  
foreign material in the gas supply line, a dirt leg must  
be incorporated in the piping. The drip leg must be  
readily accessible and not subject to freezing  
conditions. Install in accordance with  
recommendations of serving gas supplier.  
Joint compounds (pipe dope) shall be applied sparingly and  
only to the male threads of pipe joints. Do not apply  
compound to the first two threads. The joint compound used  
must be resistant to the action of liquified petroleum gases.  
Figure 4  
Before placing water heater in operation check for gas  
leakage.  
Soap and water solution, or other material acceptable for  
this purpose, shall be used in locating gas leaks. Matches,  
candles, lighters, or other ignition sources shall not be used  
for this purpose.  
Where used with propane (LP gas) a separate correct  
propane regulator must be installed at propane tank to deliver  
propane to BOSCH regulator at 11’’ W.C. pressure.  
PRESSURE TAP  
PRESSURE REGULATOR  
MANUAL GAS VALVE  
Figure 3  
WARNING  
The heater and its individual shutoff valve must be  
disconnected from the gas supply piping system during any  
pressure testing of that system at test pressures in excess  
3,45 KPa (½ psig).  
The water heater must be isolated from the gas supply piping  
system by closing its individual manual shutoff valve during  
any pressure testing of the gas supply piping system at test  
pressures equal to or less than 3,45 KPa (½ psig).  
The water heater, including the pressure regulator and  
manual valve provided with it, must not be operated at gas  
supply pressures in excess of 3,45 KPa (½ psig).If  
overpressure has occurred such as through improper testing  
of the gas lines or emergency malfunction of the supply  
system, the gas valve and regulator must be checked for  
safe operation. Make sure that the outside vent valves are  
protected against blockage. These are part of the gas supply  
system, not the water heater. Vent blockage may occur during  
ice storms.  
5
 
OPERATING INSTRUCTIONS  
LIGHTING INSTRUCTIONS  
WARNING  
1. STOP! Read the safety information, (first section) of the  
Lighting Instruction Plate on the cover.  
If the water heater has been damaged or exposed to flood-  
ing, fire, or sooting do not operate the heater until all cor-  
rective steps have been taken by a qualified serviceman.  
2. The main manual gas valve must be closed (turn valve  
handle clockwise  
, see fig. below ) and the gas  
FILLING  
valve button  
mark.  
slide to the far left under the OFF  
Before proceeding with operation of the water heater make  
sure that the system is filled with water.  
3. Wait five (5) minutes to clear out any gas. If you smell  
gas, stop! Follow ‘’B’’ in the safety information above on  
this label. If you don’t smell gas, go to next step.  
-
-
-
-
Turn the water flow selector handle clockwise (  
against stop.  
Open all hot water faucets connected to the W125K…to  
allow trapped air to escape from heater and piping.  
Close all faucets, once water flows freely and all air  
has escaped from system.  
)
4. The pilot burner is located behind the peephole located  
in the front center of the jacket directly below this  
instruction plate.  
The water heater is now ready to be lit.  
5. Slide the gas valve button to right to pilot position (  
and open main manual gas valve (by turning valve handle  
counterclockwise ).  
)
SERVICE HINT  
The screen (strainer) in the water valve, located in inlet of  
the water valve, may require occasional cleaning due the  
foreign material in the water supply. This will restrict the  
flow of water and may affect heater operation and prolong  
filling time. To inspect the screen, close the cold water sup-  
ply valve ahead of the heater, disconnected cold water line  
from inlet of water valve and remove screen from inlet. Clean  
if required, replace screen in inlet to water valve, recon-  
nected and open cold water supply valve.  
6. Fully depress gas valve button (  
pushing pilot igniter button (  
) and light pilot by  
)
7. Observe pilot flame through peephole. The gas valve  
button should be held down at least 10 seconds with  
pilot burning. When the gas valve button is released the  
pilot should continue to born.  
-
If the gas valve button does not pop up when released  
stop and immediately call your service technician or gas  
supplier.  
LIGHTING  
-
If the pilot will not stay lit after several tries, slide the gas  
valve button to the left. Under the OFF (  
the manual gas valve to the off position and call your  
service technician or gas supplier.  
) mark, turn  
Light the water heater in accordance with the instructions  
on the Lighting and Operating Plate on the water heater.  
For your convenience, the instructions are repeated below.  
8. Slide gas valve button to the right to the ON position  
) the heater will now fire when water is drawn at  
(
a rate greater than the threshold flow rate (see manual).  
Note: If main burner should fait to ignite make sure pilot is  
burning. If not repeat lighting procedure steps 1 through 8.  
6
 
TO TURN OFF GAS TO APPLIANCE  
1. Close main manual gas valve and slide the gas valve  
button to the OFF position.  
PRESSURE TAP  
PRESSURE REGULATOR  
MANUAL GAS VALVE  
PEEPHOLE  
WATER TEMPERATURE CONTROL  
To adjust water temperature use water flow selector, at  
heater. For hot water rotate control Knob to the right.  
GAS VALVE BUTTON  
Turn  
Turn counter-  
clockwise:  
more water  
- Warm  
PILOT IGNITOR BUTTON  
clockwise:  
less water  
- hot  
WATER FLOW  
SELECTOR  
PRESSUREREGULATION  
The pressure regulator supplied with the water heater is  
adjusted to operate on the gas specified on the rating plate  
and:  
The control knob regulates the water temperature by ad-  
justing the flow rate of the water through the heater:  
-
Maximum flow rate through the heater is 5L/min, (1.3  
U.S. gal/min.) with temperature rise of 25°C (45°F) at  
full input.  
-
in Canada, is factory preset to deliver gas at the high  
altitude pressure setting listed on the rating plate and as  
shown below.  
-
Minimum flow rate through the heater is 2.3 L/min. (0.6  
U.S. gal/min) with temperature rise of 55°C (99°F) at  
full input.  
-
in the U.S., is factory preset to deliver gas at the standard  
altitude setting listed on the rating plate and as shown  
below.  
For normal hot water use the control knob of water flow  
selector should be turned clock wise ( ) to stop and  
remain in that position. This will permit control of remote  
temperature by mixing more or less cold water with the hot  
water supplied by the heater.  
The pressure setting of the gas pressure regulator should  
be checked at installation to assure that the setting is correct  
for the gas being used and the altitude at which the  
appliance is installed. See rating plate on the unit, or the  
chart below for proper settings.  
In Canada for a heater being installed at standard altitude  
(0- 2.000 ft. elevation) the manifold pressure should be reset  
at installation to value shown on the rating plate, or chart  
below for standard altitude.  
Note: If flow rate is adjusted to a point where water flow  
through the heater is less than 2.3 L/min. the main  
burner will shut-off. This is a safety feature.  
The gas pressures specified below refer to flow pressure  
taken at the pressure tap in the gas inlet pipe (just above  
pressure regulator, figure 5) while the heater is operating at  
full input.  
Warning: Hot water can produce 3rd degree burns,  
in 6 seconds at 60°C (140°F)  
In 30 seconds at 54°C (130°F)  
Appliance Regulator Pressure Setting  
HIGHTEMPERATURELIMITSWITCH  
Pressure tap  
Type of Gas  
Altitude  
The BOSCH W125K…instantaneous gas water heater is  
equipped with a high temperature unit switch with a set  
point of 90°C (194°F). If the water temperature at the sensing  
bulb should exceed 90°C (194°F) the switch will open,  
interrupting the safety circuit and stopping gas flow to the  
pilot and main burner.  
kPa  
1.41  
2.61  
1.14  
2.09  
Inches, W.C.  
standart  
(0.2,000 ft.)  
high  
natural  
propone  
natural  
5.7  
10.5  
4.6  
(2,000-4,500 ft.)  
propane  
8.4  
Note: The high altitude ratings listed are Canadian Gas  
Association high altitude ratings for the appliances and are  
only valid in Canada. In the U.S. the National Fuel Gas Code,  
ANSI Z 223.1/NFPA 54, recommends for high altitude  
installations, above 2000 feet that the input rate be reduced  
4% for each 1.000 feet above sea level.  
Pilot outage as a result of high limit operation indicates that  
the heater is not functioning properly. The heater should be  
checked by a qualified serviceman and the reason for  
malfunction corrected. To relight pilot follow instructions  
provided on the unit.  
7
 
PREVENTIVE MAINTENANCE  
PILOT AND MAIN BURNER  
If the main burners fail to exhibit above characteristics they  
must be cleaned, either by blowing them off with compressed  
Check pilot and main burners at least every 12 months for air or by washing them in soap and water and rinsing.  
the proper flame characteristics.  
If it proves necessary to wash the main burner assembly the  
The pilot flame should envelop approximately 10 mm (3/8 following procedure should be used:  
inch) of tip of thermocouple.  
1. Turn off the gas supply to the water heater.  
2. Disconnect pilot gas tube at the gas valve and unscrew  
the gas manifold assembly union nut, where the gas  
manifold inlet pipe connects to the gas valve and remove  
the gas burner assembly.  
3. Wash in soap and water and then rinse.  
4. Reassemble - Check for gas leaks after reassembly and  
correct as required.  
5. Refer to Lighting Procedure to relight the heater.  
VENTING  
The vent piping and finned heat exchanger should be checked  
at least once a year for dust and carbon deposits and  
cleaned as necessary.  
3mm  
PRESSURERELIEFVALVE  
At least once a year the pressure relief valve should be  
checked to insure that if it is in operating condition.  
Before testing the relief valve take necessary precautions  
to prevent water damage. Lift the lever on the valve several  
times until the valve seats properly and operates freely. Do  
not check the relief valve when hot water is being draw and  
the main burner is on. Water exiting the valve under these  
conditions would be hot.  
Figure 6  
If the pressure relief valve on the appliance discharges this  
is an indication of water pressure above the pressure rating  
of the relief valve. If the pressure relief valve continually  
discharges on a periodic basis contact the water supplier  
or local plumbing inspector on how to correct the situation.  
Do not plug the pressure relief valve.  
If the pilot flame is too small, then the pilot burner must be  
cleaned. The position of the igniter electrode should also  
be checked to assure that electrode is approximately 3 mm  
(1/8’’) from pilot, see figure 6.  
The main burner should exhibit the following characteristics:  
· Provide complete combustion of gas.  
PERIODIC REMOVAL OF LIME DEPOSITS  
· Cause rapid ignition and carryover of flame across burners.  
· Operate quickly during ignition, burning and extinction.  
· Burner flames should be blue and there should be no lifting  
of flames from burner ports, figure 7.  
In hard water areas, depending on frequency of use, the  
heater should be checked for accumulation of calcium  
carbonate (lime) and delimed, if necessary. Thereafter a  
regular schedule, based on initial inspection findings, should  
be set up to delime the heater. Delivering instructions are  
available from your Bosch dealer.  
Figure 7  
8
 
8 700 703 038  
8 700 203 027  
8 703 305 197  
NOTE:  
THE HOT WATER OUTLET HAS BEEN UPGRADED TO A FLEXIBLE  
TUBE. NOTE POSITIOON OF ASSEMBLY - FLAT COPPER WASHER  
INSIDE BUSHING - THEN ATTACHED TO MALE END OF FLEX TUBE.  
*DO NOT OVER TIGHTEN*  
9
 
10  
 
INTERIOR COMPONENTS DIAGRAM  
AND PARTS LIST  
Nº Description  
W125  
8705401730  
8702000218  
1
2
Front shell  
Water flow selector handle  
#N/A  
4
5
6
7
8
8
9
Draught diverter  
Heat exchanger  
Temperature limit  
Hose  
Main burner  
Main burner  
8705505361  
8705406149  
8707206040  
8700703038  
8708120011  
8708120301  
8700103008  
8708107002  
8708105538  
8700507055  
8708200005  
8748200173  
8700707334  
8747202083  
8707011466  
8707011145  
8707201012  
8747202209  
8707002497  
8703406204  
8700503050  
8708503063  
8707402018  
8708500166  
NG  
LPG  
Washer  
10 Sparking plug  
11 Pilot burner ( 75 )  
11a Filter  
12 Pilot injector ( 5 )  
12 Pilot orifice (49)  
13 Pilot gas pipe  
14 Thermocouple  
15 Gas valve  
NG  
LPG  
NG  
LPG  
15 Gas valve  
16 Magnetic unit  
17 Termo connection  
18 Water valve  
19 Repair set for water valve cover  
20 Diaphragm  
21 Slow-ignition valve (C)  
22 Volumetric water governor  
23 Selector screw  
#N/A  
25 Water strainer  
26 Venturi (H)  
8700507001  
8708205210  
11  
 
ASTRAVAN DISTRIBUTORS, LTD.  
123 Charles Street  
North Vancouver, B.C. V7H 1S1  
Phone Canada: (604) 929-5488  
Phone USA:  
(206) 860-8448  
 

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