06:15AM | 03/08/00
Member Since: 03/07/00
1 lifetime posts
I am interested in any info on tankless hot water heating systems.


06:36AM | 03/08/00
Hi Carla, check out the info at this link Hot Water
Good luck!

Tim in Oregon

02:09PM | 03/08/00
Member Since: 02/07/00
11 lifetime posts
Try this information on a "Bosch" heaterSpecifications -- Bosch WR and W Series Water Heaters
These instantaneous water heaters are available for natural gas or propane -- providing hot water in seconds for as long as needed. They can be installed as a central system or at point of use for specific requirements. All units are wall hung, saving valuable floor space.

Since there is no water storage in the unit, no tank-type heater can match them for economy of operation or ease of installation. Units may be connected in parallel to accommodate flow rates which exceed the capacity of a single heater.

W125-K W400-K5 WR400-1K WR400-3KB
Rated Input (BTU/HR) 40,000 117,000 117,000 117,000
Minimum Input (BTU/HR) 20,000 58,500 33,000 33,000
Maximum Flow Rate (GPM) 1.3 4.0 4.0 4.0
Minimum Flow Rate (GPM) 0.6 1.8 0.5 0.5
Hot Water Output (GPM)
[a] 45ºF rise 1.3 4.0 (1.0 - 4.0) (1.0 - 4.0)
[b] 100ºF rise 0.6 1.8 (0.5 - 1.8) (0.5 - 1.8)
Flue Size 4" 5" 5" 5"
Water Inlet (NPT) 1/2" 1/2" 1/2" 1/2"
Water Outlet (NPT) 1/2" 1/2" 1/2" 1/2"
Gas Inlet (NPT) 1/2" 1/2" 1/2" 1/2"
Overall Size:
Height 25 3/8" 30 5/16" 30 5/16" 30 5/16"
Width 10 5/8" 17 5/16" 17 5/16" 17 5/16"
Depth 9 1/8" 8 11/16" 8 11/16" 8 11/16"
Shipping Weight (lbs) 25 44 44 44
Gas Consumption:
LP-GAS (lbs./hr.) 0.9 - 1.85 2.7 - 5.4 1.5 - 5.4 1.5 - 5.4
NAT. Gas (Cu. Ft./hr.) 18.6 - 37.0 54.3 - 108.8 30.6 - 108.8 30.6 - 108.8
Inlet Water Pressure:
Min. pressure for showers 30 30 30 30
Min. working pressure (PSI) 13 8 13 13
Max. working pressure (PSI) 150 150 150 150
Gas Inlet Pressure Requirements
LP-GAS 11 11 11 11
NAT. GAS 7 7 7 7

All performance specifications are based on 1075 BTU's Per Cubic Foot at sea-level, water pressure of 50 PSI, 7 column inches natural gas, 11 column inches LP Gas. Maximum inlet water pressure 100 PSI, and 50ºF incoming water temperature. Your figures may vary due to the deviation from these standards as well as your usage habits.


W125-1K -- Small and compact, this unit is popular in cottages, RV, and marine, hot-tubs, portable bush showers, animal grooming, mobile blind cleaning trucks, mobile food service trucks, etc. Now available for natural gas and propane.


WR400-1K / WR400-3KB* -- Flow control, this modulating unit combines high efficiency with high output, plus low minimum flow rate. Output temperature may be preset to any level between 90º F and 140º F, and the selected temperature will be maintained with + / - 5º F indefinitely. The WR400-1K is suitable for Single Family Residential or Commercial / Industrial, including use as a 180º F booster for sanitation systems. The WR400-1K is compatible with virtually all residential appliances and plumbing equipment. Simple to install - no field adjustments needed. *Has electric ignition


W400-K5 -- Especially designed with 40 percent less flow resistence for commercial and industrial for steady-flow applications, they are ideal for pump recirculation with storage. Our AMS package is easy to mount adjacent to existing electric tanks for conversion to gas. Can be used as 180º F boosters for conveyor type commercial dish washers. Rugged performer in car/pressure wash applications. Use in our hot-mode package to supply potable and space heating integrated systems. Optional power vent packages available.



Push button piezo-electric pilot
Automatic flame failure gas cut-off
Safety interlocked controls
Long-life, high-quality copper heat exchanger
Slow ignition valve that minimizes burner ignition noise and sooting to prolong life
3--4 times life of tank type heaters and repairable
Available for Natural or LP
Overheat protection provided by hi-temp. limiter and pressure relieve valve
Automatic thermally activated overheat
High-efficiency, low-maintenance stainless steel burners
Pilot and burners protected from clogging by filters
All water contracting parts: copper, brass or stainless steel
Easy wall mounting

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