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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
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.
Customer Rating: 
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Bosch does not stand behind their product
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.
Customer Rating: -
tankless water heater
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.
Customer Rating: 
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Tankless Water Heater Rocks !
Besides all the space I've gained, I've lost nothing in terms of hot water delivery.
That is a win - win situation. Don't expect your gas bill to be cut in half just because your gas usage has been halved. The gas is the least expensive item on my bill. Don't try to save money by not installing the correct exhaust stack. Double-walled 6" in diameter and 5 feet long with cap is a must.