My plumber has looked over the tank and is very impressed with the construction. He will install it as soon as the new thermostat I have ordered arrives. Looking forward to see how the addition of it will lengthen the cycling of the boiler.

Excellent service! We can’t wait to get our new boiler!!!!!!!

Work great and app works great too. Only been a couple months so hopefully they keep working good for a long time.

I am very pleased with my new boiler. It is a well-made little unit and was delivered to me complete and damage free. Two mentionable items. First, I had to swap the wires going to the flame detector, other than that the system started and operated perfectly. Secondly, the design of the hopper is not as advertised on MBTEK website. It is unpainted galvanized metal construction with a slide open lid not a hinged lid. I like the design, no complaints there, I’m only pointing out that it’s not what I thought I was getting.
I’ve been operating the unit for about 3 months with no issues. I went as far as to purchase wood pellets from every big box store around and the unit performs the same using all of them. I have even operated the unit on 100% Cherry Pits, and it operated flawlessly.
The one feature that I was really looking forward to, was the ability to use firewood as a small supplemental heat source. I started a firewood burn twice now, just for fun. It does a good job controlling the solid wood fire. I was pleasantly surprised. My only complaint is that, at the end of the burning, I have to manually switch the unit to pellet mode. I hope that there is a software update (or I figure out how to set it up properly) that it will allow the unit to automatically switch over to pellet fuel after the solid wood fuel burns out.
Lastly, I would highly recommend MBTEK. They have answered several of my questions in a timely manner and are very easy to contact.

I bought this pump for my UNI 95 and it works as advertised with vary little power consumption. But I find this pump is on the small side for this boiler to run the most efficient and would only recommend for smaller boilers.

So far I have been happy with the MBTEK Duo 300 Boiler. It took a long time to get the unit, but it seems to be very well built. This is a very large Boiler, We have 4 buildings that this unit is heating. It has kept everything warm through the recent Blizzard and cold spell, so I am pleased with the output. We are still trying to get the settings right so that we are not using too much fuel, but that will come with time. The biggest complaint I have is that the unit only reads in Celsius, and cannot convert to Fahrenheit. Also the unit runs on 230v so has to have a power converter.

So far it’s been fantastic, does 2600 sq house along with domestic hot water. Was a little confused when it came in with a euro plug but customer service was extremely helpful with very quick responses.

Service was good and parts were delivered promptly

Good quality valve

Product seems very good even if they are the cheapest on the market. Although i must say that installation instruction are weak and support is bad. You must have knowledge on installing and parametering things. I highly recommand for advanced or expert consumers.

I was due for a new furnace and the prices of heating oil was a challenging thought. I took the leap and ordered/installed a Phoenix 30 after seeing my father in Wisconsin heat his entire home with a pellet stove. I couldn't be happier. The upfront costs of the install will pay themselves off in two years and I will continue to heat my home in New England for the small amount of $900 a year. Well worth it if you are looking to save some money. I love it!

I didnt purchase a boiler, as it was still in testing and unable to sell to public.

Works great, simple app control. Good to be able to control things remotely via my phone.

I bought this and installed it about 100 feet from my house in a separate shed with underground pipes to feed my floor heat. I only live 25 miles from a coal mine. I feed the hopper using a grain auger from a trailer and fill the hopper about once a week or more. Like all Cole furnaces it takes maintenance and is somewhat dirty when one has to clean it which is only every couple of weeks. The control unit blew out after about a year and I had to buy another one but this one seems to be working fine. I had to figure out how to install it myself since he was nobody around here who would ever seen one of these. I had to convert the 24 V thermostat from the house to a 12 V input to the control board and I also had to get 240 V pumps but actually it has been quite successful. I'm very happy with the unit and would definitely buy one again, I'm not a plumber or an HVAC professional and I wish the instructions could've been a little more clear, but I was able to figure them out and it worked fine.

The UNI 40 boiler i bought is successfully heating my home in a fairly cold climate (-30 is not uncommon). I am burning mostly deadfall so far and not high quality firewood. The boiler has a bit of learning curve to get operation down pat. One observation is that while the boiler is very responsive in terms of heat output in a short period of time, performance efficiency would be enhanced with a significant buffer tank which I plan to install in due course. I am pretty happy with the boiler to date and installation/operation were straightforward and relatively simple to master.