The heater performs its task 100% and is energy-efficient. Without going into unnecessary details, I purchased one unit last year and now I've bought two more for two additional apartments. I plan to buy another unit next year, so that says something.

Quick implementation; after 20 years of use, I bought the same Kospel heater because it works very well and is simple to operate and install.

SB 200 with a capacity of 200 L from Kospel was purchased for a 20 kW eco-pea coal boiler. It has been connected and functioning efficiently for two weeks. I connected the two coils in series, which speeds up water heating, and it indeed heats quickly. The thermometer is large and clear. It looks solid and aesthetically pleasing, as noted by other users. The descriptions state that the casing finish is "skay." What is "skay"? Skay is soft and a substitute for leather. Here, the boiler has a very good hard plastic coating that is impact-resistant; it may somewhat resemble skay but is very easy to clean if it gets dirty, in a light gray color. At the top, there is an aesthetic plastic cover. I looked inside and thought it could use another 1 cm of insulation, which I have added. The casing connection, including the strip and the edging around the pipe connections, is made of stainless steel. Importantly, there is the possibility of connecting an electric heater. Inside, everything is painted blue. It was difficult to decide on a brand, but I finally chose Kospel. How long it will last—nobody knows. I recommend this boiler.