During the selection of the boiler must take into account many different criteria. Before you buy a boiler, you must decide how often you will use it. Heart of the boiler unit is a furnace, boiler usually quickly breaks down precisely in this part. Cheap boilers are often out of order because of the burned stove. Such boilers are not subject to repair, they can only dispose of. The warranty period of normal service is not cheap boiler is at least 20 years. Similarly, the price is affected Automatic boiler. The larger pot is automated, so will be more expensive and better. Good automation not only provide a good auto work, but also security. More cheap boilers - with a little automation. In such boilers t need to install and adjust it manually. More automation is present in the burner, which is called modulation. Such a burner is capable of retaining a certain t, make it lower or higher depending on the period of time. Furthermore it allows to take care of gas, which is an indisputable advantage of the boiler with automatic-modulated burner. Other elements of the boiler is usually the same in most of the boilers of different companies. Boilers can be combined (on different fuels). Combination boiler can operate on gas and liquid combustible material, such as solar oil or fuel oil. To reset the boiler to another type of fuel, you only need to replace the burner. If you want the unit to function for a long time, you need to take care of the fuel used. Repair and maintenance of boilers, which operate on liquid fuel is much more worth than the boilers that run on gas. Since in our country in the gas industry there is often not stable pressure, therefore when the pressure is reduced far below the allowable minimum, an inexpensive boiler without a modulated burner is unable to block the gas entering the valve. This can lead to sad consequences. More expensive boilers with automatic self block this valve, excluding the loss of gas in the room. Oil boilers require periodic maintenance, because due to diesel fuel or other type of fuel quickly appears fumes and soot, which can eventually flake off and clog the burner. If gas and oil boilers are not satisfied, you can choose electric boiler. The same should pay attention to the quality of the electrical components of the boiler. It starters, spark arrester, as well as heating elements. In an electric kettle is a defense that is usually installed in the more expensive boilers. Accordingly, the protection of savings can be further incur costs associated with replacing burned-heating elements.