A comment
I thought for a long time, but still installed in September 14, the Borinsky boiler AOGV-23, equipped with SIT automation. Bought it in his Norgaz. As for convenience, I did not really like the automation. When you start to set the minimum temperature in the off-season, the boiler begins to interpret, while making a sharp pop when the burner ignites. The boiler was installed in the kitchen, so I had to get used to this turn of events. The boiler is single-circuit and the water is heated separately, using a gas column.
The boiler capacity is 23.3 kW, installed in a house with an area of 150 sq. M., I took it with a margin, but it was possible to buy less by capacity. A domestic-made boiler, cost me 16,400 rubles. It weighs somewhere 55 kg, the dimensions he can not be called small, 994X403X463 mm. In principle, a normal boiler, you can get used to it.
Minuses
automation is not convenient