If you want a backup fuel, it is best to use a pot, but the hybrid (gas / diesel, gas / solid fuel). Manufacturers that produce Combination boilers are listed in a review published on the website "Ing-In." If you want to get a reservation (independence) of electricity, you should pay attention to the use of volatile boilers. At the use of nonvolatile boilers should be considered a very important feature: they can exercise their fundamental property (work without power) only when used in gravity heating systems. Ie in those who work on the natural flow of fluid without the use of pumps. This condition applies only to single storey houses a small area.
In other cases, when the heating is working at home on forced circulation (used pumps), power outages will stop the pump and heating will not work, even when operating the boiler. Moreover, the boiler, turning off the pumps, may withdraw from system. You also need to bear in mind that all boilers have pezorozzhig volatile. With the loss of such gas boilers must be run manually, in contrast to the boilers with electric ignition, starts automatically. To work in a cascade volatile boilers also are not intended.
Increase the total power wall boilers use wall boilers gives you some useful advantages (compared to the floor): The ability to place boiler in a small room, ease of implementation chimney (there are lots of models with closed combustion chamber). No need to organize massive chimney on the roof, you can make a plastic chimney "through the wall", can be to organize the air supply for combustion of gas, "the street" and not from the boiler room. If you are very attracted to these properties (or if you have restrictions on the use of boilers), and the area of your house more than 450 square meters, it makes sense to use two (or more) wall of the boiler, taking into account the maximum power of most models of 35 kW. In this case, in addition to saving space, you also automatically get a backup safety feature boilers. To understand the price issue, we present a cost comparison dvuhkotelnoy installation on wall fired boiler with the cost of a single-floor boiler (for the home area of 450 square meters). To the boiler with a boiler, based on the data, "Ing-Ying", is worth about 384 370 rubles., while a similar boiler room, but on the basis of 2 boilers, will cost about 425 770 rubles. The comparison results show that for space savings and other "amenities" will pay 10% more. The difference is much more moderate than in the case with floor-standing boilers, but life is much inferior wall boilers floor – 2 – 2.5 times. What should I consider when choosing a system of two wall-mounted boilers? When making your choice, consider the following arguments: the saving floor space, "There is no" need for a bulky chimney, provides redundant boilers, wall hung boilers Life 2 – 2.5 times lower than the floor, two wall mounted boiler, "a cascade" would cost 10% more expensive than an outdoor boiler. When choosing a model for wall hung boilers dvuhkotelnoy install a must to pay attention to what they are for cascading. Outcome: thereof recipe for all cases does not exist, but given information to help you make the right choice. Full text articles on the site, "Ing-In