Editorial Product Review:Amazon.com Item Description:The Bosch 125HX-LP AquaStar propane tankless water heater can cut your water-heating costs by up to 50 percent while providing 4.3 gallons of hot water per minute, heating water on demand and supplying hot water at a rate of 4.3 gallons per minute -- enough to meet the needs of one major application (shower, dishwasher, etc.) at a time. Its gas valve and burners turn off when there's no demand for hot water, and you can control temperature by using the modulating gas valve. Automatic electronic ignition provides heat quickly, while stainless steel burners and a copper heat exchanger ensure long life. Measuring 8-3/4-by-29-3/4-by-18-1/4 inches, and weighing 44 pounds, this compact heater takes up relatively little space and can be mounted to a wall or in a closet with the included hooks. It is designed to vent vertically as sold, or you can vent horizontally with the optional AQ1 kit. Bosch backs its heater with a 12-year heat exchanger warranty and 2-year parts warranty.
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Buyer Reviews
Average Buyer Rating:
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Old 1960's tech you're lucky if it works for you
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 smaller boilers (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 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.
Customer Rating: 
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Works for me
We bought one of these about a year back from Amazon and I installed it myself.
The installation instructions were fairly complicated and were clearly written with a contractor in mind with lots of details about what size connections were necessary, gas pressure, water pressure, and tables for vent size and height. It's definitely an advanced project for a do-it-youself job.
We've never had any problems with it coming on. (We have plenty of water pressure from our well.) The water flow is merely adequate at perhaps 1/4 the flow from the cold water tap in the tub. It is good and hot, and it never runs out even when I forget and run a load of laundry just before my wife uses the tub. Generally I turn the hot water on first for a few minutes, then turn on the cold for a few seconds and get in.
If you have a huge tub and not much patience, you might want to spring for the bigger model.
Customer Rating: -
Not a good choice
I ordered this to use at our cabin. When it arrived the box looked perfect...no dents or rips, etc. The unit was sold as "new", however when we removed it from the package it was apparent that someone had damaged it and repackaged it as new. It doesnt work. Very disappointing. Would not order an appliance from Amazon again.
Customer Rating: 
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Bosch tankless water heater
I have had a gas tankless water heater now under the Bosch name for 20 years and am totally happy with it. My original lasted for 15 years and I am now on my second tankless. I have compared my electric bills with several of my neighbors who use electric hot water heaters and without exception their monthly electrical bills were nearly twice mine, evidence of the electricity cost savings. We NEVER run out of hot water. There is, however, a 15 second wait for the water to become hot after turning a faucet on--a very slight inconvenience.
