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25 of 27 people found the following review helpful
on January 6, 2007
I bought this product 18 months ago. I love it. Here's the deal:

This thing is rated on how much it can increase the temp of the water.. So it performs differently in the summer when the incoming water is 80 degrees versus the winter when the incoming water is 35 degrees. It has a switch for "summer" or "winter" settings which configures it to use three burners or one burner, depending on the season. There is also a temperature dial you can use to adjust the water temp that comes out.

One other thing about this tankless system: You set the temp of the water for the only as hot as you want to take showers, so when you take a shower or bath, it's full hot only. (The only reason that water tanks are set really hot is so that you mix them down with cold to extend the amount of water they can make, but this is not needed with a tankless system.)

The bottom line is that you'll find yourself adjusting the temp on this thing every few weeks to contend with changing seasons (not a big deal... just a dial). This is definitely a change in concept when it comes to hot water, but I am used to it and plan on using them for the rest of my life.

(Side note: Some people are like, "What? This thing sucks! The water is not hot enough!!" My response is that I do not have the water set too hot. Why do I need the water hot enough to burn me? I wash all my clothes in cold, and the dishwasher has its own heating elements to make the water as hot as it needs.. So I set my heater to be comfortable--nothing more.)
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31 of 36 people found the following review helpful
on July 14, 2006
We have had the hydroignition Bosch 125 Natural Gas Tankless for a year and a half now. It is absolutely incredible. I have checked our gas bill each month for the first year and the minimum we have saved (gas usage, not gas bill) is 22% each month! We have used as much as 77% less gas than the same month the previous year. Unlimited hot water on demand! No drawbacks. Plus, it uses a small space compared to the dinosaur tank water heater we had before. It fits attached to a stud where it's out of the way!!!! I would NEVER go back to the traditional tank water heater. Temperature control is extremely simple. Don't let unknowledgeable plumbers steer you astray with ridiculous things like "the water doesn't get hot" UNTRUE!!!!! Those plumbers just don't know and don't care to know and are stuck in the plumbing dark ages. This is the only way to go. Bosch stands behind this product.
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7 of 7 people found the following review helpful
on February 6, 2013
My Bosch 1600h tankless water heater with hydro turbine ignition froze and burst its tubing on the third 14 degree morning of this winter. This heater and the VP125 that preceded it have frozen at least 4 times. A few times I have been able to solder the crack, but I was not able to this time. As Bosch recommended after the previous freeze up, I DID put in a small whole house air input blower. With a very sensitive switch to measure the interior versus exterior air pressure.
The heater froze while this was operational, a 60 watt bulb was directly below the heater, and the hot tap in the sink was set for trickle.
The only easy part of this miserable history was going to Lowes and paying $228 for a 40 gallon conventional water heater.
What would you expect to happen when a product has its frost vulnerable copper pipes directly below a four inch opening to the winter air? I'll tell you- a $700 heater and the $350 replacement coils will be sold for scrap. Unless one of you current owners wants to email me "btb_lskb@lycos.com" and I will send you any parts or the whole tham ding for the cost of the postage. Ben
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12 of 14 people found the following review helpful
on December 1, 2007
The problem with buying a tankless water heater is that the typical home is not set up for installing it, and the amount of work needed is significant. I waited 20 minutes on hold to a Bosch technical help line before giving up and trying to get help by email. I discovered that their technical help is provided only for contractors, who will charge a small fortune to install a tankless water heater. Bosch will not give any help to the buyer if it's more complicated than something like putting on the control knob.
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7 of 8 people found the following review helpful
on February 6, 2008
We have had our water heater for 4 years, this winter the Heat Exchanger broke and the water heater poured water all over our ulitity room, ruining our floor. I called bosch, and spoke with a very rude tech support person, she stated the heat exchanger FROZE up, stating we should have winterize the water heater, so the part is not under warrenty . We never winterized the heater before. I asked to speak with her supervisor and she refused. I am going to have to buy another water heater but it will not be a Bosch.
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11 of 14 people found the following review helpful
on December 25, 2006
I have not been satisfied with this water heater. When they say it is for 1 application, they mean it. If you are taking a shower, and someone washes their hands at a sink, the shower will get cold. Also, you basically have to turn the water on at almost full blast for the heater to kick on. If the pressure is too low, it will just click the igniter without lighting. The warmth of the water seems to fluctuate for no reason. It will be hot for a few minutes and then get colder. I usually have to adjust the temperature in the shower at least once per shower. I live in a 2-story house with the heater in the basement. I know two other people with this heater that live in 1-story houses and do not have my issues. Keep in mind that it will be at least $50 for the parts for the re-routing of the pipes. Plan on the work taking at least 1 day, maybe 2. Also note that it takes an extra 10 seconds to get warm water over a water heater tank. This should be expected though.
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3 of 3 people found the following review helpful
on March 13, 2013
Had 125 HX NG for 5 years. Serviced by 2 factory authorized plumbers ( one authorized mechanic did not show up for appointment and did not call.). Over the years have not had consistent hot water. Burners do not light off. etc. Very expensive service that did not solve problem. No solution suggested except an estimate for repairs that was twice the cost of a new unit. I finally trashed it and returned to a standard Rheem.
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7 of 9 people found the following review helpful
on January 3, 2007
Besides saving room, this heater has reduced my gas bill significantly, and provided unlimited hot water
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8 of 12 people found the following review helpful
on November 16, 2008
This will work OK for a two/three person single storey house if you're lucky enough to have it installed by a plumber who understands the system.
All tankless heaters conform to 1960's western European technology and back then we all used a small tankless at the point of demand. One in the kitchen for the sink and the laundry machine (not many people had a separate laundry room) another in the family bathroom. As houses and demand grew the 1970's oil shock hit and effected gas prices too. European Govt.s brought out strict energy regs and people began to switch to highly efficient central instant boilers assisted by highly insulated small tanks. These systems also heat the house in winter. An average installation costs $6,000 US dollars per 1000 sqft of house.

These Bosch heaters are 50 year old technology built bigger for the USA to replace your usual central tank boiler.

If you're going to use them I recommend using two(or three depending on demand) smaller heaters (but that requires a plumber moving pipes around) one for kitchen/ laundry one for showers.BUT you're still using old tech. I now live in Mexico and here Bosch has local competition and the Bosch boilers cost half of these Amazon prices and have a 9 volt battery rather than gas pilot or 110v connection. Actually in Europe tankless heaters were used because most houses just had a cold water supply round the house and these heaters ran off a branch from the cold loop. You could try that .. just a couple of feet of copper pipe,,,, er bet it's not up to code though. When I look at the building services tech used in the USA I can't help notice the similarity to your car industry. Sorry.
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on July 7, 2014
I've had the Bosch Aquastar 125HX-NG model since Jan 2007. Initially I was very happy with it, except for the fact that after awhile (4 1/2 years) the pilot would not always ignite on the first attempt. Contacting the tech support at Bosch, they walked me through a list of steps, one of which was to "wiggle the pigtail" (meaning the ignition coil that contains the spark). It seemed to work for another month but eventually the unit kept failing to ignite. I ended up spending another $200 purchasing a new control unit which solved the problem. Bosch, by the way, failed to correctly diagnose the problem. A friend experienced in electronics explained that "a spark is not always a spark". (take note, Bosch)

Now, another 2 years later, the same thing is happening again. If (and when) it fails again, I will toss the unit and switch back to a standard tank unit.

Bosch support would do nothing to honor their product. I don't think they really stand behind the product if it means they should send out a replacement part for a customer. One time and an expired warranty, OK that was my risk. Twice...and shame on me.

I would not recommend a Bosch tankless unit to anyone. Their ignition system design is flawed, and, very expensive to fix.
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