An open or closed burner in a gas boiler is needed

When choosing a gas boiler, the primary question about choosing the type of burner is whether you need open or closed. And can we save on this choice?
When choosing a gas boiler, the primary question about choosing the type of burner is whether you need open or closed. And can we save on this choice?
A lot of households are heated with wood or coal, while many consumers are interested in choosing a solid fuel boiler that provides the following.
The most fundamental question when choosing a gas boiler is to acquire a single-circuit or double-circuit.
To buy pyrolysis boilers for a large (daily) laying of firewood? - or let them further please with their appearance the seller on the shelf of his shop? The device is clearly ambiguous, and first of all, we, the users of heating equipment, are struck by the price - 2 to 3 times more than for an ordinary solid fuel boiler. What kind of money?