Bosch 2400ES Aquastar Tankless Water Heater

Bosch makes some of the most respected tankless water heaters on the market. They recently came out with a new unit .  Their high capacity product is the Aquastar 2400ES. It is available in both Natural Gas and Propane versions. Unfortunately it has not rated well on line. It looks like several people have had issues with the unit and Bosch’s customer service is severely lacking.

Here are the specs on the 2400ES unit:

• Power Input NG: 19,900-175,000 Btu LP: 19,900-175,000 Btu
• Minimum Flow to Activate (gpm) 0.65 gallons per minute (gpm)
• Flow Rates 90° F rise  3.2 gpm 77° F rise / 3.8 gpm 65° F rise / 4.6 gpm 55° F rise  5.3 gpm 45° F rise  6.4 gpm
• Energy Factor NG: .82 LP: .82
• Thermal Efficiency NG: 82% LP: 82%
• Dimensions: H: 30 ½” W: 17 ¾” D: 11¼”
• Weight 67 lbs.
• Modulating Gas Valve Yes
• Ignition Electronic (120V plugs in)

2400ES advantages:

• 2-year warranty on heat exchanger 2 years on parts
• Provides ENDLESS supply of hot water
• Electric Ignition
•  Saves up to 50% versus old tank heating cost
• Compact and lightweight
• Can simply hang on the wall
• Modulating gas valve to control temperature
• Delivers up to 6.4-Gallons per minute
• Pressure relief valve included
• Direct vent room-sealed combustion, you will need fresh are to power the unit as well as exhaust

This unit unfortunately has not had very good reviews online. People are say that Bosch’s support is terrible and and you spend extraordinary amounts of time on line. Here are some quotes:

This is the worst Tankless water heater, I may not get any hot water during a shower. I alway get the error code EA. I tried to call their service department. They are the worst person in this world to help you to resolve any problem. They are useless.

Sheesh. We’ve had a plumber/technician here FIVE times. Yes, FIVE times. And this water heater has been nothing but a headache. Various problems include NO hot water or the gas light going out just to name a few. DON’T BUY THIS WATER HEATER.

The units also appear to have loud sound issues and leak issues. I recommend the Takagi TK series as the most reliable.

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