A combi boiler is a highly efficient single unit that provides hot water for the water supply and the heating. The combi takes water from the mains and heats it on demand whenever the tap or heating is turned on. That means that there’s no need for a storage cylinder.

Simpler terms: A combi boiler is a combination hot water boiler/hot water heater that will heat hot water for space heating and domestic hot water used for washing, bathing, cooking, dishwashers and more.

Most Combi boilers installed today are condensing low mass boilers that are 90%+ efficient and have modulating technology that allows the combi boiler to raise and lower the output based on outdoor temps and indoor conditions, similar to using cruise control which results in lower gas bills and more comfort.

Another benefit of the Combi boiler is the ability to rapidly heat domestic hot water, basically on-demand, providing unlimited hot water which will be helpful for filling large tubs, multiple showering, vehicle washing and no standby heat loss with continually heating a tank that is only used a couple times a day.

Combi boilers only utilize a small space, usually are wall-hung, allowing for the removal of your existing floor mount boiler and tank water heater that can take up substantial floor space.

If you are wondering which is best for you or your family, ASP's HVAC experts will help you pick the perfect heating, venting and cooling equipment and provide you with options.