BBQ PITS BY KLOSE 1355 JUDIWAY Houston, Texas 77018-6005 USA
Single, Double, Triple, & Four Sink Setups.
Available on any size Klose
Sinks can be made of
© Copyright 1986-2013
New Tankless Hot Water On Demand with
New Top Mounted, Gravity Fed Water Tanks
On Demand Hot Water Appliance details
. Burner output proportional to hot water flow demand for maximum energy efficiency
. Stainless steel burners with stabilized blue flame
. Built-in corrosion resistant draft diverter
. Adjustable water flow restrictor to ensure that water
flow demand will not exceed the heating capacity of
. Safety flame sensor at pilot burner
. Automatic overheating protection shut-off sensor
. Copper heating coils for endless supply of hot water
. Easily removable one-piece cover
. Easy one person installation
. Electronic Pilot Ignition driven by hydro-generator.
Specifications (Technical data)
Approved in US/Canada
Maximum flow rate: 3.7 GPM (14 l/min) at a 45°F
101,772 Btu/h (29.8 kW)
117,000 Btu/h (34.3 kW)
Efficiency in %
Recovery efficiency 80%
28,000 Btu/h (8.2 kW)
Gas connection (inches) - ¾.
Inlet gas pressure under maximum operation*
. Propane: 10.5. - 14. water column
. Natural Gas: 5.7. - 14. water column.
* To measure Gas Pressure, see Measuring Gas
Pressure, chapter 3.6.
. Hot water connection (inches) - ½.
. Cold water connection (inches) - ½.
. Water valve material: Polymer (PPS) (Polypropylene
. Minimum water flow: 0.5 gallon/minute (1.9 l/m)
. Minimum recommended water pressure: 30 PSI
. Bottom of heater
. Depth (in): 10.5. (265 mm)
. Width (in): 18.25. (460 mm)
. Height (in): 36.75. (936 mm)
. Weight: 64 pounds (29 kg).
. Flame failure device (ionization flame rod sensor)
. Pressure relief valve (supplied with heater)
. Over heat prevention (temperature limiter).
IP X5 (protection against water drops).
not approved or designed for:
. Manufactured (mobile) homes, RV's or boats
. Heating or other recirculating/pumping applications*
. Solar/preheat backup or high temperature booster
* This includes domestic hot water circulator pump loop
systems that may previously exist in a home hot water
system. The use of a small electric mini-tank (4-6 gallon
size) should be used for this application; when
designed so the pump will circulate the hot water in the
mini-tank only and through the building's hot water
return loop (timed or thermostatic controlled operation
of the pump is commonly done). The GWH-425-HNO
should be plumbed in line before the mini-tank water
heater, contact BBTNA if further instruction is needed.
3 Installation instructions
Please follow these instructions. Failure to follow
instructions may result in:
B Damage or injury.
B Improper operation.
B Loss of warranty.
Please contact BBT North America with any questions.
3.2 Proper location for installing your heater
Carefully select the location of the water heater.
Follow the guidelines below:
B 1. Locate the heater where an adequate gas line size
and plumbing connections are feasible and
B 2. The hot water lines should be kept short to save
energy. Centrally locating the water heater is best. It
is always best to have hot water lines insulated to
prevent the possibility of any freeze damage.
B 3. The water in this heater is cold and always remains
cold except for the times that hot water is being used.
The heater is equipped with freeze prevention
equipment that will operate and prevent freezing of
the water in the heater to 5°F with no wind chill.
Electrical power must be maintained to the heater to
allow this to function.
WARNING: Proper insulation of the
water lines below the heater is required
if below freezing temperatures, below
32°F, are ever anticipated!
Danger: If the temperature drops
below 32°F, freeze damage to the water
heater itself must be prevented by
turning off the power to the heater, then
disconnecting the plumbing connections,
as well as removing the drain
plug and introducing short bursts of
compressed air (20-40 psi) through the
heater's connections. This will remove
the residual water in the horizontal
pipes and water valve.
Danger: Keep children away as the top
of the water heater vent cap will get very
hot during operation. Install in a place
that prevents the top of the heater being
reached by small children.
Danger: Flue gases will be released
through the vent cap. Flue gas is very
hot and contains carbon monoxide. The
heater cannot be installed indoors. To
prevent risk of fire and poisoning by
carbon monoxide, assure all clearances
indicated in manual.
Danger: Surface temperature around
vent cap is less than 140°F, except
highest top surface of vent cap may
Danger: Do not place or store any
combustible material within 5 feet of the
appliance. Risk of fire could be caused
by hot flue gas.
Warning: Flammable materials,
gasoline, pressurized containers, or any
other items or articles that are potential
fire hazards must NOT 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.
3.5 Gas piping & connections
Before connecting the gas supply, check the rating
plate on the right side of the heater to be sure that the
heater is rated for the same gas to which it will be
Note: comes with a gas pressure regulator installed.
Disconnecting or altering the gas pressure regulator
will be a violation of CSA certification of the unit.
The regulator supplied with the heater is preset for the
gas shown on the rating plate to the correct pressure.
It is an appliance level regulator designed for (low inlet)
pressure (less than 1/2 Psig or 14" W.C.).
B Install a manual gas shut off valve, on the gas supply
B Install a union when connecting gas supply.
B The minimum diameter required for any appliance
connector used is ¾..
B National Fuel Gas Code requires that a sediment
trap (drip leg) be installed on gas appliances not so
equipped. The drip leg must be accessible and not
subject to freezing conditions. Install in accordance
with the recommendations of the serving gas
When connections are made, check for gas leaks at all
joints. Apply some gas leak detection solution to all gas
fittings. Bubbles are a sign of a leak. A combustible gas
detector may also be used to detect for leaks.
HIGH ALTITUDE INSTALLATION
The pressure regulator provided with the heater is
adjusted to deliver the proper gas pressure (as
indicated on the rating plate and in the manual for
altitude up to 2000 feet (660 meters) above sea level.
On appliances being installed above 2000 ft (660
meters) elevation, the inlet gas pressure should be set
at installation to the value shown below.
Note: The gas pressures specified below refer to
pressures taken at the pressure tap on the gas inlet pipe
just above the regulator. See chapter 3.6 for measuring
MAXIMUM INLET GAS FLOW PRESSURE SETTING
GAS LINE SIZING
The gas supply piping should be sized according to the
applicable code for a maximum draw of 117,000 BTUH.
Measure the length of gas supply line and use the tables
in Fig. 8 or the gas line manufacturer”s sizing tables to
determine the pipe diameter necessary to
accommodate the BTU demand of the unit. If there are
more gas drawing appliances on the line, size the gas
line according to the total maximum amount of BTU
draw for all appliances.
Note: Under sizing the gas line may result in diminished
output and improper operation. See chapter 3.6 for the
procedure to confirm gas pressure.
Warning: DO NOT connect to an
unregulated or high pressure propane
line or to a high pressure commercial
natural gas line.
Warning: The heater must be isolated
from the gas supply piping system
during any pressure testing of that
system at test pressures equal to or
more than 0.5 psig. If overpressure has
occurred, such as through improper
testing of the gas lines or malfunction of
the supply system, the gas valve must
be checked for safe operation
Danger: If you have a leak, shut off the
gas. Tighten appropriate fittings to stop
leak. Turn the gas on and check again
with a gas leak detection solution.
Never test for gas leaks using a match
Altitude Nat. Gas
0. - 2 000 ft 5.7. 10.5.
2 000 ft - 4 500 ft 4.6. 8.4.
Table 3 Above 4.500 ft consult your local gas provider
8 716 473 148
FOR NATURAL GAS
Maximum Capacity of pipe in Cubic Fee
3.6 Measuring gas pressure
B Shut off gas.
B Remove front cover and locate inlet gas pressure
measuring point on the right side of the gas valve.
B Loosen screw from test point on the left side of gas
valve and connect manometer tube on test point.
Static pressure test
B Turn gas supply back on.
B Operate all other gas appliances on same gas piping
system at maximum output.
B Record static gas pressure reading on back page of
Operating pressure test
B Run high hot water flow rate.
B Set flow control knob fully clockwise.
B Set slide control to the right.
B Record operating gas pressure reading on back
page of manual.
Gas pressures lower than 5.7" W.C. for Natural Gas or
10.5" W.C. for LP Gas will result in insufficient degree
rise to the hot water being used, and must be corrected.
See Gas Line Sizing under chapter 3.5.
3.7 Water connections
When facing the heater, the ½. cold water inlet is on the
bottom right and the hot water outlet is on the bottom
B INSTALL A UNION WHEN CONNECTING
WATER PIPE TO FACILITATE ANY
NECESSARY CLEANING AND SERVICING.
Although water piping throughout your structure may be
other than copper, we recommend that copper piping
or suitably rated stainless steel flex line piping be used
for at least three feet before and after the heater (follow
local codes if more stringent). Never sweat any rigid
piping directly to or beneath the water connections,
damage can occur to the internal water valve from
heating of the pipe. Plastics or other PEX type plumbing
line materials are not recommended for connecting
directly to the water heater. Keep water inlet and outlet
pipes to no less than ½" (12.7mm) diameter to allow the
full flow capacity.
It is recommended that all water piping below the
heater be properly insulated to avoid heat loss. If
below freezing temperatures are ever anticipated where
the heater is located, insulation material is required and
must be capable of protecting the piping from freezing.
The freeze protection that is equipped within the heater
will not prevent any freeze damage to the exterior water
If the cold and hot connections to the heater are
reversed, the heater will not function. Be certain there
are no loose particles or dirt in the piping. Blow out or
flush the lines before connecting to the water heater.
Full port valves should be installed on both the cold
water supply and hot water outlet lines to facilitate
servicing the heater (see Fig. 9). For installation on a
private well system with the use of a pressure tank, the
lowest pressure range setting recommended is 30-50
psi (2.07 and 3.45bar).
Connecting the pressure relief valve (PRV)
A listed pressure relief valve supplied with the heater
must be installed at the time of installation. No valve is
to be placed between the PRV and the heater. No
reducing coupling or other restriction may be installed
in the discharge line. The discharge line must be a
minimum of 4. above a drain and installed such that it
allows complete drainage of both the PRV and the line.
The location of the PRV must be readily accessible for
servicing or replacement, and be mounted as close to
the water heater as possible. See Fig. 9. To install the
PRV, a suitable fitting connected to an extension on a
.T. fitting can be sweated to the hot water line.
Support all piping.
4 Operation instructions
4.1 For your safety read before
operating your water heater
A. This appliance is equipped with electronic ignition for
lighting the main burners. When turning the heater on,
follow these instructions exactly.
B. What to do if you smell gas.
WHAT TO DO IF YOU SMELL GAS
B Do not try to light any appliance.
B Do not touch any electric switch; do not use any
phone in your building.
B Immediately call your gas supplier from a neighbors
phone. Follow the gas supplier.s instructions.
B If you cannot reach your gas supplier, call the fire
C. Use only your hand to turn the on/off control switch.
Never use tools. Follow these instructions exactly. If
control switch is jammed, close the gas supply and call
a qualified service technician. Attempted forceful repair
may result in a fire or explosion.
D. Do not use this appliance if any part has been under
water. Immediately call a qualified service technician to
inspect the appliance and to replace any part of the
control system and any gas control which has been
4.2 Lighting instructions
B 1. STOP! Read the previous safety information.
B 2. Turn off power supply to heater.
B 3. Open the cold water inlet supply to the heater fully.
B 4. Open a hot water faucet to permit the water to fill
the heater and the piping and to eliminate the air
trapped in the system.
B 5. Close the hot water faucet after the water flows
freely and all the air has escaped from the system.
The water heater is now ready to operate.
B 6. Open gas isolation valve. Wait five (5) minutes. If
you smell gas, STOP! Follow .B. in the safety information
above. If you do not smell gas, go to the next
B 7. Set the switch (located behind the sliding viewer
window on the front panel strip) to the .ON. position.
In this position, the water heater is ready to use.
Note: On first time initial installation, existence of air in
the gas supply line and in the water line may cause
some ignition delay. In that case, repeatedly open and
close the hot water tap in order to restart the ignition
process until all the air has been purged.
B 8. Turn the hot water faucet on to the minimum flow
rate required to activate the heater. The automatic
ignition system first ignites the safety pilot burner
which then ignites the main burner in about 4
B 9. The pilot flame will extinguish 10-30 seconds after
the burners come on. The burners will remain on until
the hot water tap is turned off.
B 10. For maximum power, slide gas valve button all the
way to the right.
4.3 To turn off appliance
B Turn off the manual gas shut off valve on the supply
line to the heater. See Fig. 11.
B Turn power switch to the off (O) position.
B Drain water lines if unit will sit for a long period of
4.4 Setting the water temperature
This unit has a gas control that modulates burner
input in response to flow. Its purpose is to ensure that
the hot water temperature will remain steady, although
the water flow demand might vary. The output
temperature can be adjusted with either the
temperature adjustment knob or the gas control slide.
Fig. 10 Temperature Adjustment Controls
Temperature adjustment knob
The temperature adjustment knob on the front bottom of
the heater (see Fig. 10) adjusts temperature by
adjusting flow capacity. See table 4 for details.
5 Maintenance and service
5.1 Maintenance intervals
The 425 HNO requires periodic maintenance. The
below time maintenance intervals should kept the unit
operating for many years.
B Inspect inlet water filter screen ( 5.2)
B Inspect pilot assembly and flame ( 5.3)
B Inspect burner assembly ( 5.4)
B Inspect vent assembly ( 5.6)
Every 2 years
B Lubricate and clean water valve ( 5.2)
Every 3 to 5 years
B Rebuild water valve ( 5.2)
B Clean pilot assembly and clean or replace orifice
5.2 Water valve
The water valve is the main control that tells the heater
to fire. If the periodic maintenance is neglected, more
costly damage may occur over time.
Inspecting inlet water filter screen
Shut off the installer supplied cold water supply valve.
Disconnect water pipe going to the back of the water
valve. Remove filter from back of water valve. Clean the
filter and inspect for damage. Replace if the filter is at all
damaged. Inspect the top of the water valve for signs of
a water leak or corrosion. If present, rebuild the water
valve. (See below).
Lubricating the water valve
A more detailed instruction is available on our website
at www.boschpro.com. Shut off all water to the unit and
disconnect water pipe going to the back of the water
valve. Disconnect water pipe going to heat exchanger
by removing pin and pulling pipe out. Loosen two set
screws at the base of the gas valve and drop the water
valve down. Separate the two halves by removing 5
screws on the top of the water valve. Apply lithium or
faucet and valve grease to the pushrod (see Fig 14,
pos. 31). Inspect and clean the venturi (see Fig 14,
Rebuilding the water valve
Several parts within the water valve should be replaced
every 3-5 years. The parts list and instruction can be
found on our website at www.boschpro.com.
The pilot should burn with a clean sharp blue flame. The
flame should fully envelope the bend of the flame sensor
rod. If it does not, clean the pilot assembly per
Cleaning pilot assembly
Disconnect the flame sensor rod cable and the igniter
cable by pulling gently down. Remove two screws holding
pilot assembly in place. Loosen compression fitting
and remove pilot assembly. NOTE: The orifice sits on
top of the compression fitting DO NOT LOSE. Polish
flame sensor rod and igniter tip with emery cloth. Clean
out pilot assembly and orifice with carburetor cleaner. If
heater is an LP unit, replace orifice. Caution: Do not
5.4 Main burners
The main burner flames should be blue, with a more
intense blue cone in the center core. Yellow flames
could be a sign of wrong size gas orifices or dirty
burners, or a blockage on the heat exchangers fins. If
some burners have yellow flames while others have
good flames, it is likely that dust, lint or spider webs
have partially clogged the burner venturis. To clean the
burners, contact a gas service person.
5.5 Vent assembly
Inspect the draft hood and heat exchanger fins for signs
of soot build-up or any other foreign material such as
spider webs. Clean out any debris found in the vent
hood. Signs of soot indicate insufficient combustion air
or exhaust draft. Check for vent assembly blockage or
combustion air blockage on the underside of the unit.
5.6 Mineral scale build-up
When operated at lower temperatures settings, this unit
does not accumulate mineral build-up. If
however, the heater is used at the higher temperature
settings and the water has a high mineral content,
periodic descaling may be necessary. The heating coils
should be flushed with a descaling solution. Consult
your dealer or BBT North America for instructions.
Consult your service person.
Stainless Steel Sinks with Solid Polished Brass Faucets are Nice
Double Sink Setup in Polished Aluminum Floor Plate.
Triple or even Four Sink Setups also Available here.
Sinks shown here on a 42 Inch Diameter by 10 foot Mobile
with 42 x 42 Inch Upright Slow Smoker, & gas fired heat box
over the Firebox, 5 burners on the rear, & steak grill on the nose.