TEK 1 Instantaneous Whole House Water Heater
Fuel type:	Natural Gas (NG) or Propane (LPG)
Exhaust:	Stainless Steel Forced Exhaust System * Exhaust can be vented normally (through the roof) or directly through the wall .
Controls:	Mechanical Lever to limit the maximum water flow for overall water volume. The volume is controlled by your faucets.
Gas :	Manual Mechanical Knob to control the maximum temperature. A hydronic valve controls the necessary gas to maintain the desired temperature.
Power:	Min 23,000 BTU Max 86,000 BTU
Efficiency:	87%
Capacity:	Min: 0.5 Gallons (One of the lowest in the industry!) Max: 3.0 Gallons of hot water at 120F (combined with cold water at faucet, it's enough hot water supply for two LEGAL showers running in the same time.)
Ignition:	Electronic two stage control, Advanced Ion Technology. No pilot light to waste fuel! The unit is powered by a standard 120 volt wall outlet.
Safety:	- The entire unit is completly sealed. Because of this, no ventilation space is required around the unit, therfore it will not take in any air from the room. - The exhaust flue is surrounded by the intake flue. Any bit of exhaust gas leak will get sucked back into the unit, causing it to shutdown. - This double exhaust system also removes the risk of anything catching on fire upon contact with the flue. - The ignition is computer controlled. If any misfires occur, the units detects this malfunction and shuts down to prevent damage. - The unit includes two unit overheat sensors, which will shutdown the unit in case it overheats. - The water intake is fitted with an overpressure release valve and a screen filter, both of which protect your investment. - The entire heat exchange core is manufactered out of copper for better heat conductivity and longer life. - The entire burner and flue systems are manufactered out of stainless steel.
Clearances:	Exhaust clearance: 0" (insolated by intake air, cold to touch) Waterheater body top: 4" Waterheater body sides: 1" Waterheater body front: 1" Underneath waterheater: 8" (to facilitate the gas and water pipe conections and the installation of a pressure relief valve) Note: The water heater body never exceeds 100F on any surface point regardless of the amount of time that it was on.
Dimensions:	Water inlet : ½ inch Water outlet: ½ inch Gas inlet : ½ inch Exhaust flue diameter: 3.5 inches Intake flue diameter: 4.5 inches Unit weight: 37 pounds Complete unit: 25" X 13.5" X 7.5" Transport box: 30" X 15.5" X 11.5"

* System uses special exhaust flues, which can be found here.

Electrical schematic can be found here.
Mechanical schematic can be found here.