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  best tankless water heater Bosch Aquastar Tankless Water Heater 1600H bosch aquastar water heater bosch tankless water heater 2400es Electric Tankless Water Heaters energy saving tips Energy Star Environment gas tankless water heaters heating water Takagi takagi. noritz Takagi heater Takagi T-H1 Tankless Water Heaters

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:

The Bosch Aquastar tankless water heater 2700ES is a large model, allowing your family to be taking three showers at once, or perhaps more likely to be taking two showers while doing a load of laundry or dishes.  It is larger than most families will actually need, as  two activities at a time in a whole-house system will be adequate for most medium-sized families. Note that in very cold climates, where tankless water heaters have colder water coming into them, this unit might only do two activites at a time to your satisfaction.

Think it's a monster unit? It is in terms of capacity. You are most unlikely to ever run out of hot water, even in those colder climates. But in terms of size, like all tankless water heaters, it's really quite small and hangs on a wall in your house with various ways of achieving direct venting. It has a built-in power vent for this purpose.

Be sure that the unit is properly installed -- that meaning reading the manual and ideally having someone install it who has had experience with tankless water heaters. If not properly installed, it may not work right.

There are also outdoor installation kits available, in warmer climates only. Other bells and whistles include electronic ignition, and an optional remote thermostat.It is available for both natural gas (NG) and propane (LP).

The ES at the end of 2700ES means that it is listed as an "Energy Star" model by the US government ranking system developed by the Department of Energy. You can get a US tax credit of up to 30% of the price of this unit AND the cost of installing it.

Here are links to the LP and NG models at Amazon:

Bosch 2700ES LP Aquastar 7.2 GPM Indoor Tankless Liquid Propane Water Heater

Bosch 2700ES NG Aquastar 7.2 GPM Indoor Tankless Natural Gas Water Heater

And this should show it at eBay, or you may see add-on parts depending on how the eBay sellers do their titles

The Bosch tankless water heater 2400ES is a gas model suitable for doing two hot water activities at once, such as a shower and a load of laundry. It is available in both natural gas (often abbreviated NG) and in propane (LP) models.  The ES at the end of the model number 2400ES means that it has received US Department of Energy "Energy Star" ranking. Only some gas models receive this ranking, and no electric ones.

This model qualifies for the US tax credit for tankless water heaters, which is up to 30% of total cost of buying the unit and of having it installed. Read more

The Bosch Aquastar water heater line includes a variety of tankless water heaters, all gas – both natural gas (sometimes abbreviated NG), and propane (often abbreviated LP). The two kinds of gas require some different fittings, so be sure to get the kind you will need in your installation.

The Bosch Aquastar 2400ES

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