Bosch Aquastar Tankless Water Heaters 1600H and 1600P

The Bosch Aquastar Tankless Water Heater 1600P and 1600H are among the smallest Bosch units at this time. The difference between them is in the ignitation -- the H has a hydro-igniter and according to the specs at Amazon it might qualify for a tax credit, though Bosch doesn't claim that on its website.

These hot water heaters are meant for only one use at a time, so you need to be willing to live with that for them to be a good candidate for you.

Here is the product description for the 1600P: Bosch, 1 Major Appliance Or Shower At A Time, Natural Gas Tankless Water Heater, 117,000 BTU Input Delivers 3.3 Gallons Per Minute At A 55 Degree Fahrenheit Rise, Drives Standing Pilot, 1/2 Gallon Flow To Activate Burners, Vertical Venting Only, Must Use 5" Double Wall B Vent Pipe, Modulating Gas Valve From 28,000 To 117,000 BTU's For Optimal Performance, 1/2" Male Nominal Pipe Thread Gas & Water Connections, Natural Gas Pressure, Minimum 7" Water Column To Maximum 14" Water Column, Water Pressure Minimum 18 PSI To Maximum 150 PSI, Warranty 12 Years On Heat Exchanger & 2 Years On Parts, No Electrical Needed, CSA Certified.

And here it is for the 1600H: Bosch, 1 Major Appliance Or Shower At A Time, Hydro Ignition, Natural Gas Tankless Water Heater, Hydro Ignition Means No Standing Pilot Or Electricity Needed, Water Flow Spins The Hyrdro Igniter Which Generates The Millivolts Needed To Ignite The Gas To The Burners, 117,000 BTU Input Delivers 3.3 Gallons Per Minute At A 55 Degree Fahrenheit Rise, Standing Pilot, 1/2 Gallon Flow To Activate Burners, Vertical Venting Only, Must Use 5" Double Wall B Vent Pipe, Modulating Gas Valve From 28,000 To 117,000 BTU's For Optimal Performance, 1/2" Male Nominal Pipe Thread Gas & Water Connections, Natural Gas Pressure, Minimum 7" Water Column To Maximum 14" Water Column, Water Pressure Minimum 18 PSI To Maximum 150 PSI, 69% Energy Factor, 80% Thermal Efficiency, T & P Valve Included, Warranty 12 Years On Heat Exchanger & 2 Years On Parts, Qualifies For The Energy Policy Act Credit, CSA Certified.

Amazon carries them... here are links. Read the customer reviews and you may think twice.

Bosch 1600P NG AquaStar 4.3 GPM Indoor Tankless Natural Gas Water Heater

Bosch 1600P LP AquaStar 4.3 GPM Indoor Tankless Liquid Propane Water Heater

And here is what is on eBay, if any: