Bosch Natural Gas Tankless Water Heater Aquastar 250SX

Pros: Looks great and well built.
Cons: Tankless heater did not serve our needs very well.

I used to have two 40 gallon hot water tanks that I could run in parallel or series, and normally ran them in series with the first one as a warming tank. One of them rusted out November 2004 and needed to be replaced. A friend told me about ...

Pros: Multiple consecutive showers without "running out" of hot water.
Cons: Expensive to switch from tank water heater, poor performance at lower water flows, slow response.

Things to keep in mind before switching to a tankless water heater: 1) there may be added costs to replumbing your water lines or your gas lines - since this unit hangs on a wall and your old tank was in the middle of the floor, you are going to have ...

Pros: Small installation footprint up on wall.

Should save some money in natural gas bills.
Cons:

-Very expensive to purchase
-Water waster
-Poor customer support.

I bought and received the Bosch from Amazon and didn't get what I bargained for. Prerequisite projects included: 1- installing a new oversized gas line ($350) 2- z-flex thimbles and wall venting for the Bosch exhaust gases($500) 3- ...

Pros: Takes up less space, aren't heating water for storage, and you may get a rebate
Cons: Costs for installing, limited plumbers, cold water when it errors,  water temperature fluctuates.

We purchased a Bosch Aqua Star 250sx tankless water heater when we finished our basement two years ago. We purchased this model as it is suppose to handle multiple appliances at one time. We had several reasons in mind for a tank less water ...

Pros: Endless showers, not risk of 40 gallon water tank leaking in house.
Cons: temp. adj.; installation costs, problems with unit.

I talked my wife into a tank less water heater, told her everyone was going that way. Get that big bulky 40 gallon tank out of the house(ours was installed inside). The thought of that much water in the house was scary enough. She was excited about more ...

Pros: Endless supply of constant hot water
Cons: Reliability, Noise, Expense!!

I purchased this unit to replace a 50 gallon gas water heater that was on its last legs. The material that I read about this water heater made me thing that this was the right thing to do. After all, how can you argue with unlimited hot water and fuel ...

Pros: Cool heat exchanger. Save money. No more hard water build up to worry about.
Cons: High gas demand at max output. Stainless steel ducting is expensive.

Regarding the review previous to this one, go to designerplumging.com and pay $989 instead of $1500 at Home Depot. Takes time to put in yourself but that’s where the fun is. It's not the fault of the heater; plumbing is slow, especially ...

Pros: Small size
Cons: Doesn't work with shower filters. Tech support is understaffed. Expensive to install.

This water heater has been a huge disappointment to me. From the very first, it has had problems with maintaining the temperature. I simply cannot get it to stay at the nice, warm temperature that I want. Every time I shower, the water changes from ...

Pros: WHEN it works,the best shower ever, I'm sold on the "concept" of tankless heaters.
Cons: poor design.when it acts up, you get NOTHING! it doesn't "sort of" work.

to start off, I was sold on this by my brother in Houston (this will play a big factor in a minute) who had one installed and worked trouble-free for 6mos. or more, he loved it. I was amazed at the compact size for a "whole-house" heater and thought ...

Pros: All the hot water you could ask for.
Cons: Watch out if you live where the temperatures are colder than 32 degrees!!

Thought this was going to be great. We spent over $1000 on this unit, really liked the idea of conservation and was willing to pay extra, but sometimes "GREEN" is only the color of your $$ flying out of your wallet. You do have to wait a considerable ...

Pros: It can heat a lot of hot water at once.
Cons: Not good if you just want to supply a single low-flow usage

I bought one locally for $998...and spent at least that much on installation. First usage the heater made a noise so loud I was concerned the neighbors would call the fire department (it sounded a little like a fire alarm). Next day I called customer ...

Pros: Endless hot water, lower gas bills
Cons: Installation can get expensive

I have read many of the other reviews for this unit on this site and have to say that it looks like every user has had a unique experience with their Bosch Tankless heater. I bought mine off of a friend (no warranty or support from Bosch) and installed ...

Pros: When it works and after a lengthy wait it delivers endless hot water.
Cons: Too long to heat, which wastes water. Not compatible with low-flow clothes washers.

I purchased a Bosch 635 ES Pro-Tankless water heater for my home and used a certified Bosch installer to put it in. It has been nothing but trouble. First, it takes > 2 minutes to deliver hot water and my bathroom is less than 20 ft of pipe run from ...

Pros: You get in great shape with daily runs to the heater's reset Button.
Cons: The kids don't like running to the basement to reset the heater at bath time.

We saw the Bosch 125 SX tankless water heater at a Home depot display in 2003. Since we wanted to gain some real estate for a Basement bathroom we liked the idea of a tankless water heater. The benefits of continuous hot water and energy savings verses ...

Pros: It looks good and takes up less space than a regular water heater.
Cons: Time to get hot water is too long. Temperature variations are much too large.

We purchased this unit because we wanted to more environmentally friendly. We knew that the cost would be more to buy and install ($2100) over simply replacing our old water heater ($700), but felt that it would be worth it in the long run. We expected ...