Editorial Product Review:Item Description:Includes 125BO Outdoor Natural Gas Tankless Water Heater - 125BO-NG.
Amazon.com Item Description:The Bosch 125BO-NG AquaStar outdoor natural gas tankless water heater can cut water-heating costs by up to 50 percent while supplying up to 4.3 gallons of hot water per minute. Temperature control is provided by a modulating gas valve. A standing pilot light provides ignition, while stainless steel burners and a copper heat exchanger ensure long life. No vent pipe is required and this heater installs outdoors. It has freeze protection for temperatures as low as 5 degrees Fahrenheit. The Bosch 125BO-NG AquaStar water heater features safety thermocouple and overheat shutoff protection, and Bosch backs its heater with a 12-year heat exchanger warranty and 2-year parts warranty.
Note: This unit is rated for freeze protection down to 5 degrees Fahrenheit and only can be sold in the following states: Alabama, Arizona (in zip codes beginning with the first three digits 850-857 and 864), Arkansas, California (except in zip codes beginning with the first three digits 935 or 961), Georgia, Mississippi, Oregon (in zip codes beginning with the first three digits 970-975), North Carolina, South Carolina, Texas, Virginia (only in zip codes beginning with the first three digits 233-237), and Washington (in zip codes beginning with the first three digits 980-986).
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Buyer Reviews
Average Buyer Rating:
-
Poor old 1960's technology
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 have 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 $7,000 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 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 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: 
-
Something Wrong?
First I purchased the indoor model from Lowes, which doesn't say it's 'indoor only' until you open the box. So I looked for an outdoor one with the same features (ie no standing pilot). Unfortunately that's not an option for Bosch's outdoor tankless water heaters. So I purchased this, the next best option. Unfortunately, I didn't find out until I received it that it needs a standard 110 outlet for the antifreezing functionality. Since I was replacing a gas water heater and didn't have electric run to it, I had to temporarily run an extension cord. But at some point I'll have to get proper electric run.
Also, I read this other review on Amazon, before I bought it, about the wind causing the pilot light to go out. I thought that wouldn't be a problem for us since our water heater was shielded. However, we have the pilot go out about once a week and usually in the middle of a shower. It would be very difficult to send this back, but once I have some time to jump on the phone with Bosch hopefully they can help us sort it out.
Another "problem" we've noticed is that the water is too hot. And since the heater is triggered by flow rate (x/gallons per minute), we have to keep the mix of cold and hot hot enough so the water heater doesn't shut off. I'm pretty sure we have it on the lowest temperature setting, but I need to double check. Hopefully I'll find out I'm wrong.
I really thought I would love this for its efficiency and Bosch quality, but so far it's a drag. In fact, the two star rating is just for the efficiency. If I can talk to Bosch and get these issues sorted out, I'll come back and rerate it.
Customer Rating: -
very disappointing
I bought and installed this unit for a 600sf garage-apartment conversion. The tankless concept appealed to me, because it makes no sense to waste energy keeping a tank of water hot 24/7. It also mounts on the wall outside- saving some precious indoor space.
The heater was professionally installed, inspected, etc. and actually does heat water (thus the 2 stars). Unfortunately, that's the last positive thing I have to say about this $1,000 adventure.
The heater is designed to switch on at a certain flow rate. Only 2 of my 4 hot water outlets are big enough to trip the switch- my bathroom faucet (brand new & in perfect working order) doesn't 'trip' the heater even when it's open all the way, and my washing machine (also brand new) never demands enough water to turn the heater on. This is NOT adjustable- there is no way to get the heater to turn on at a lower flow rate.
It is also impossible to make 'warm' water anywhere in the apartment. The heater ONLY heats when the kitchen or shower faucet is open all the way- start mixing hot & cold, and the heater kicks off. This results in unexpected, instant cold shower!
My solution? I open another tap wide open so i can wash my clothes in hot water or take a warm shower instead of a scalding/freezing one. When i do this, everything works as expected. I get whatever temperature water I want, and as much as I want, and of course the hot water never runs out. But this "solution" means I WASTE more hot water (and energy) than I actually USE! After paying $1000 to buy and install an energy-SAVING water heater, this is an infuriating end result. I could have used a traditional storage heater for about a third as much, and it would have worked exactly as expected.
After asking around, I found out this is a common problem with tankless heaters. I wish I had done more homework before I made the purchase.
Customer Rating: -
Very displeased with this water heater!
We are very displeased with this water heater. Often when we have a windy day, maybe twice a month on average, the wind BLOWS OUT the pilot light. There is no pilot adjustment screw on the pilot. We have spent hours trying to figure out how to increase the pilot flame size to no avail.
We have read all the documentation that came with the unit and all the Bosch documentation online. For some reason Bosch documention is very careful to not discuss this issue. They keep refering to: "call your local service representative"! We do not want to pay for a service call for something as simple as adjusting the flame size of the pilot!
Often the pilot will blow out at night leaving us with out hot water for our morning showers!!!
