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

If you need to operate two major hot water appliances at the same time – shower and laundry, for example – one of your best choices is the Bosch Aquastar 2400ES. The ES at the end of the name stands for Energy Star, and indicates that this model meets U.S. government Energy Star specifications.

No electric tankless hot water heaters receive this rating, and only some gas ones.  The model 2400ES qualifies for the U.S. tax credit, which is up to 30% of the cost.

The 2400ES would be an excellent choice, as it should last 20 years or more, far longer than conventional tank-type heaters. The Bosch website states that this tankless heater will give save up to 50% of the energy you are using now, depending of course on your current setup. It is described there as "easy to install," which would mean for experienced do-it-yourselfers or installation professionals. It offers a variety of venting options, making it easier to use in a retrofit – where you are adding it to an existing house – or in a new house being built.

You might run across older models 2400E or EO; they have been updated by the 2400ES. It has the Energy Star qualification that they lack.

The 2700ES

The other Bosch Aquastar water heater which qualifies for that tax credit is the Bosch 2700ES – also a tankless Energy Star unit. This one is for larger families, as it allows your household to simultaneously use three hot water activities without running out of water at any of them. That could be two different showers going on in different bathrooms, plus a load of laundry or a batch of dishes… any arrangement that adds up to three!

The 1600 Series

The Bosch Aquastar water heater 1600P has a pilot ignition, and the 1600H has what is called a "revolutionary hydro-generated ignition system, allowing the water heater to operate without a standing pilot, electricity, or a battery. " There is also a model 1600PS which was created to be used if you have a solar hot water system, or if you heat your water from a woodstove, and want something to be a backup.

These units can just hang on your wall. The 1600P delivers up to 4.3 gallons a minute, and the others are likely similar. For smaller families, the 1600P may be perfect. It replaces the classic model 125B.

Do note---

Do be aware that installation needs to follow the instructions exactly, that Bosch doesn't have the best reputation for customer service (read Amazon reviews and others), and that getting used to a tankless heater takes some adjustments.

Here are some examples:

Bosch AquaStar 125B NG Nat Gas Tankless Water Heater Bosch AquaStar 125B NG Nat Gas Tankless Water Heater Paypal US $399.99 1d 10h 42m
Bosch GWH 2400E NG Tankless Hot Water Heater Brand New Bosch GWH 2400E NG Tankless Hot Water Heater Brand New Paypal US $550.00 17h
Bosch PowerStar Tankless Electrc Hot Water Heater AE125 Bosch PowerStar Tankless Electrc Hot Water Heater AE125 Paypal 14 Bids US $167.50 17h 6m
USED 2005 BOSCH 250X NG gas tankless hot water heater USED 2005 BOSCH 250X NG gas tankless hot water heater Paypal 0 Bid US $675.00 17h 15m
BOSCH Pro GWH C 920 ESC NG Gas Tankless Water Heater BOSCH Pro GWH C 920 ESC NG Gas Tankless Water Heater Paypal US $2,065.00 17d 10h 58m
Bosch AquaStar 1600H NG Nat Gas Tankless Water Heater Bosch AquaStar 1600H NG Nat Gas Tankless Water Heater Paypal US $399.00 1d 10h 42m
Z Vent Z Flex Stainless pipe 3 x 48 for Bosch Tankless Z Vent Z Flex Stainless pipe 3 x 48 for Bosch Tankless Paypal US $56.17 25d 13h 27m
Z vent Z Flex AL294C 3 x 24 length for Bosch Tankless Z vent Z Flex AL294C 3 x 24 length for Bosch Tankless Paypal US $39.39 25d 12h 9m
Bosch Tankless Water Heater Valve Kit w Relief Valve Bosch Tankless Water Heater Valve Kit w Relief Valve Paypal US $69.00 8d 16h 17m
Bosch GWH450ESRN PVC Vented Tankless Water Heater LP Bosch GWH450ESRN PVC Vented Tankless Water Heater LP Paypal US $1,086.99 29d 11h 4m
Bosch GWH450ESRLP PVC Vented Tankless Water Heater LP Bosch GWH450ESRLP PVC Vented Tankless Water Heater LP Paypal US $1,086.99 29d 10h 43m
104583 Bosch AQ4 Sidewall Power Vent Kit Tankless WHs 104583 Bosch AQ4 Sidewall Power Vent Kit Tankless WHs Paypal US $359.99 26d 13h 47m
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