Combined or combined boilers are compact equipment for home hot water systems and home heating systems.Both systems are provided by a single boiler and are therefore called "combinations ".The Irish Sustainable Energy Authority (SEAI)'s home energy conservation program provides grants of up to 500 euros and 700 euros, respectively, to increase the grade of heating control and gas/fuel burner boilers.The minimum requirement of this system for the circuit is two conditions, and the combination of DHW and space heating circuit can easily meet these two conditions.The high quality A-Class combined condensate boiler can easily provide fuel efficiency of up to 92%, and it can be a good choice whether it is for renovation or for new construction.Combined boilers are usually oil, natural gas or LPG gas, which can be used easily and economically in your area, no matter which fuel.Are all condensing boilers?No, heaven forbid!Although the current preference is condensing boilers, there are still many traditional combined boilers in use.The reason is obvious.Conventional boilers with an efficiency of about 80% are not in the same category as high efficiency condensate boilers.The advantages of the condensing combined boiler the combined boiler is nothing more than a wall-mounted double-function household hot water and central heating device.