Bosch 2400ES NG AquaStar 6.4 GPM Indoor Tankless Natural Gas Water Heater Review

Average Reviews:

(More customer reviews)I wanted to write an honest review of this product since I couldn't find much online about on-demand hot water heaters. Our tank broke, flooding the basement, and we wanted to look into alternative ways to heat our water efficiently. We're in Boston and the tap water here is about 45 degrees.
The way this works is that when you turn on the hot water in the house, the unit senses the water flow and begins to heat up a set of pipes inside. As the water passes through, it's heated to about 122 degrees.
The pros:
- It works normally, just like before. I turn on hot water, I get hot water.
- You don't experience any standby losses of having a tank - Gas is only used when you are actually using hot water saving both money and energy.
- The water is very hot in the shower. We can also use the dishwasher OR the washing machine with the shower. All three would probably not work well.
- There's no footprint. You put this on the wall, and it's vented outside.
- If something breaks, you replace a part rather than the entire tank, saving time and money.
- If it breaks, there's no flooding!
- We received rebates from both the gas company and from the federal government through a tax credit for the "green" purchase.
The cons:
- It costs more than a traditional tank to both purchase and install. We paid about $1000 for the unit itself, and an additional $1000 to have it installed. We had to have someone drill a new vent (both out and intake), put in stainless steel and PVC piping, and re-route the hot water in our basement.
- It takes a few seconds to up to a minute for the water to heat up.
- It's more difficult to make incremental changes to water temperature.
- You cannot get a "trickle" of hot water. The unit needs a certain flow to start in order not to damage pipes.
All in all, we're extremely happy with this unit since the cons were more a matter of up front cost (but we'll save down the road) and lifestyle changes.

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