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From the Manufacturer
For indoor installation only.The Rl94i lets you enjoy continuous hot water for up to five plumbing and appliance outlets simultaneously and always at a consistent, pre-set temperature. With a capacity of up to 9.4 gallons of hot water per minute (GPM), the Rl94i still delivers up to 40% energy savings and significant space savings. This compact, interior-mount unit vents directly to the outside with a concentric venting system. 199,000 max BTU.
Product Description.. 
From the Manufacturer
For indoor installation only.The R94LSi lets you enjoy continuous hot water for up to five plumbing and appliance outlets simultaneously and always at a consistent, pre-set temperature. With a capacity of up to 9.4 gallons of hot water per minute (GPM), the R94LSi still delivers up to 40% energy savings and significant space savings. This compact, interior-mount unit vents directly to the outside with a concentric venting system. 199,000 max BTU.
Product Description
Rinnai R94LSI-N Interior, 9.4 GPM, Natural Gas, 84% Efficiency Tankless Water HeaterLS Series interior-mount units can be placed in any room, vent directly to the outside and have an integrated condensate collector. All LS units contain a newly designed, commercial-grade heat exchanger for optimum durability. Homeowners get the reliability of commercial-grade constructionRinnai R94LSI-N Interior, 9.4 GPM, Natural Gas, 84% Efficiency Tankless Water Heater Features:; Sleek, modern design with silver fin.. 
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Rheem Direct Vent Tankless Water HeaterCOMPACT SIZE: good things do come in small packages. Rheem Tankless is about one third the size of a conventional water heater. Sophisticated technology has reduced the size and increased the features and benefits. A digital display makes setting a precise water temperature, or monitoring the unit's status, a snap! Its compact size will leave room for a water softener or extra storage.PropaneIndoor model8.4 gal./min at 35 deg F rise max., 6.7 gal./min. at 45 deg F rise .26 GPM Minimum Flow Rate, .40 GPM Minimum Activation Flow Rate, 180,000 BTU UMC-117 remote control and 10 ft. of thermostat wire is included Vent termination kit required Eligible for federal tax credits for energy efficiency Meets Low Nitrogen Oxide emmission standards.. 
Includes 27 kW Electric Tankless Water Heater - RTE-27.. 
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When compared to gas type tankless water heaters, Stiebel Eltron Tempra 15B, cost less and is less expensive to install, since it does not require venting parts. While gas type tankless water heaters with outside venting may have a 5-20% efficiency reduction (due to heat loss from gases escaping through the vent), Stiebel Eltron Tempra 15B is designed to be virtually 100% efficient. Multiple heating elements inside the Tempra 15B models activate as the water demand increases, thus providing maximum efficiency and complete comfort. Specs: Product Specs Width: 14-9/16" Flow Rate: 0.58-3 GPM Amperage: 60 Wattage: 14400 Heating Capacity: 1-2 Bathrooms Height: 14-1/2" Application: Plumbing Voltage: 240v, 208v Depth: 4-5/8" Type: Electric Efficiency: 0.99% Water Connection: 3/4" Temperature Range (F): 86-140 F.. 
When compared to gas type tankless water heaters, Stiebel Eltron Tempra 20 Plus cost less and is less expensive to install, since it does not require venting parts. While gas type tankless water heaters with outside venting may have a 5-20% efficiency reduction (due to heat loss from gases escaping through the vent), Stiebel Eltron Tempra 20 Plus is designed to be virtually 100% efficient. Multiple heating elements inside the Tempra 20 Plus models activate as the water demand increases, thus providing maximum efficiency and complete comfort. The Advanced Flow Control system, available in Plus models only, monitors and adjusts the water flow to assure a constant temperature output. Specs: Flow Rate: 0.58 - 4.5 GPM; Maximum Operating Pressure: 150 PSI; Hot / Cold inlet connections: 3/4" male threaded (Male NPT); Dimensions (Width x Height x Depth): 16 5/8" x 14 1/2" x 4 5/8"; Weight: 15.4 lbs; Voltage: 208V/240V; Amperage: 70 Amps at 208V / 80 Amps at 240V; Phase: 2 x single; Wattage: 14.. 
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Rheem Tankless Water HeaterCOMPACT SIZE: good things do come in small packages. Rheem Tankless is about one third the size of a conventional water heater. Sophisticated technology has reduced the size and increased the features and benefits. Outdoor only model6.4 gal./min at 35° F rise max., 5.6 gal./min. at 45° F rise.26 GPM Minimum Flow Rate, .40 GPM Minimum Activation Flow Rate, 150,000 BTU UMC-117 remote control and 10 ft. of thermostat wire is included Vent termination kit required Eligible for federal tax credits for energy efficiency Meets Low Nitrigen Oxide emmission standardsSpecificationNOTE: All water heaters of any type MUST be installed by a trained and licensed technician. Failure to do so may result in damage, injury or death. Warranties will be void if installed by non-licensed personnel. We will not be held liable for any damages, injury or death caused by proper or improper installation of water heaters... 
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No description for this product could be found, but have a look over at Amazon
Single Point Instantaneous Water Heaters Style: Single Point Instantaneous Voltage: 120 Wire Gauge: 10 Temperature Rise: 48° F @ 0.5 GPM Amperage Rating: 29 Kilowatts: 3.5.. 
22V40SF Features: -Natural gas short water heater. -Tank capacity: 40 Gallons. -One of a kind air/fuel shut-off device offers double protection and maintenance free. -Low NOx design for low nitrous oxide emissions. -Self cleaning. -Easy to Light. -Energy efficient. -Longer life. -High altitude compliant. -Includes brass drain valve and temperature and pressure relief valve. Specifications: -Manufacturer provides eight years limited tank and parts warranty. -Overall dimensions: 49.375'' H x 20.125'' W x 20.125'' D. For more information on this product please view the Sheet(s) below: Specifications Sheet.. 
No description for this product could be found, but have a look over at Amazon22V50F1 Features: -Natural gas water heater. -Commercial collection. -Tank capacity: 50 Gallons. -One-of-a-kind air/fuel shut-off device offers double protection. -Maintenance free. -Low NOx design for low nitrous oxide emissions. -Everkleen patented system. -Reduces fuel costs. -Provides more hot water. -No matches required. -Includes brass drain valve. -Patented magnesium anode rod design ensures rust proof tank. -Includes temperature and pressure relief valve. -High altitude compliant. -UL listed. -Gama certified. Specifications: -Manufacturer provides six years limited tank and parts warranty. -Overall dimensions: 58.25'' H x 20.125'' W x 20.125'' D. For more information on this product please view the Sheet(s) below: Specifications Sheet Brochure Owner's Manual.. 
Bosch ProTankless GWH C 800 ES NG Tankless Water Heater, Natural GasBosch ProTankless GWH C 800 ES NG Tankless Water Heater, Natural Gas Features:; 92% thermal efficiency " .90 energy factor; Condensing heat exchanger for maximum efficiency; Vents vertically or horizontally with 3" PVC, CPVC or ABS-DWV; Concentric and twin pipe venting options; Direct vent, room-sealed combustion; Ability to cascade units for increased flow rates; Suitable for recirculating applications; Outdoor installation using optional kit; Available in natural gas (NG) or liquid propane (LP); 15-year warranty; Power Input NG: 199,000 BTU/Hr; Maximum Flow to Activate 0.65 gallons per minute (gpm); Flow Rates:35;F rise@ 10.1 gpm45;F rise@ 8.0 gpm55;F rise@ 6.4 gpm65;F rise@ 5.5 gpm77;F rise@ 4.6 gpm90;F rise@ 3.9 gpm; Energy FactorNG: .89; Thermal EfficiencyNG: 92%; Dimensions H: 30;" W: 17.875" D: 11¼"; Weight 74 lbs.; Modulating Gas Valve Min Firing Rate: 19,900 BTU/Hr, Max Firing Rate: 199,000 BTU/Hr; Ignition E.. 
Energy Star rated, US made, this Tankless water heater , today at a price you can finally afford. Now you don't have an excuse for not owning a tankless water heater instead of your old gas or electricity hog. The OME 620-D NG is a wall mounted gas appliance that delivers a continuous supply of hot water on demand. The luxury of never running out of hot water, while knowing that you are consuming less energy, is the ultimate feeling in water heating. This unit can provide enough hot water for multiple showers or any other water-using appliance! There is no storage tank keeping water hot all day and reheating it time and time again. The OME 620-D NG has a digital temperature display to show you the temperature of the outgoing hot water. The OME 620-D NG will deliver a savings of at least 50% on your energy bill while providing an endless supply of hot water at your desired temperature. The electronic ignition guaranties no energy-use when the unit is idle. With computerized sensors, saf.. 