Heating and Sanitary Water: The boiler provides the hot water for the heating circuit continuously and as required. When sanitary water is required, hot water to the heating circuit is temporarily cut-off and sanitary hot water is provided by mean of a three-way valve and a secondary heat exchanger Only Sanitary Water: similar to the function of an instant water heater, the boiler only provides instant and continuous hot water as required, returning to a standby mode when the hot water tap(s) are closed.

Yes, the piping needs to be changed in order to connect the heating circuit to the boiler instead of the central heating system.

Have the optional Iranian Standard
CE certification
Engineering Society’s approval
Certified by the Research Center of the Ministry of Housing

The major difference is that in room-sealed boilers the combustion happens in a closed chamber and both the exhaust and air intake is done by the special dual chimney provided by BIG. Whereas in regular or open boilers the air required for combustion is provided from the installation area.

Yes, by using the BIG boilers with built-in storage.