Rinnai IP090199C
- 90,000 / 199,000 BTU/h
- Maximum input · space heating / domestic hot water
- Compact condensing combi boiler with Smart Sense gas valve
Boiler Installation & Replacement
Choose a hot-water boiler that works with your radiators, baseboard heaters or air handler.
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What Should a Proper Boiler System Include?
Popular Combi Boilers
Rinnai IP120199C
- 120,000 / 199,000 BTU/h
- Maximum input · space heating / domestic hot water
- Higher space-heating input and on-demand domestic hot water
Navien NCB-190/080H
- 80,000 / 160,000 BTU/h
- Maximum input · space heating / domestic hot water
- Compact wall-hung design with dual stainless steel heat exchangers
Navien NCB-240/110H
- 110,000 / 199,900 BTU/h
- Maximum input · space heating / domestic hot water
- Dual stainless steel heat exchangers and multi-zone control connections
Navien NCB-240/130H
- 130,000 / 199,900 BTU/h
- Maximum input · space heating / domestic hot water
- Higher space-heating input and on-site natural gas or propane configuration
How It Works
A combi boiler serves both space heating and domestic hot water. The closed heating loop and the water delivered to taps are separate circuits.
What is a combination boiler?
A combination boiler fits both functions into one compact appliance. In a typical fire-tube design, the primary heat exchanger heats the boiler water. When a tap or shower opens, the controls usually give domestic hot water priority. Incoming cold water passes through a separate heat exchanger, where it picks up heat from the boiler water without mixing with it.
When the thermostat calls for space heating, a diverter valve routes the heated boiler water into the home’s heating loop. Depending on the system, that loop may serve radiators, baseboard units, radiant floors or a hydronic air handler.
What are the main advantages of a combi boiler?
Combining space heating and on-demand hot water saves equipment space and can remove the need for a separate domestic hot-water tank. A condensing model also recovers some heat from its exhaust. Comfort depends on matching both heating capacity and hot-water delivery to the home, especially if several fixtures may be used at once. A single cabinet also keeps the main controls and service points together.
How does it compare with a traditional boiler?
A traditional heating-only boiler is designed mainly to send hot water through a hydronic distribution system. The water circulates through radiators or other emitters and returns to the boiler. If the home also uses that boiler to heat domestic water, the system may use a separate indirect tank or heat exchanger before delivering potable water to the taps.
A combi boiler integrates both functions. It produces domestic hot water when a fixture calls for it, much like a tankless water heater, and switches back to space heating as the controls allow. A separate tank can still be a better fit where peak hot-water demand is high.
Does a combi boiler save money?
Savings depend on the equipment being replaced, fuel prices, the home’s heating load and the household’s hot-water use. Producing hot water on demand can avoid standby heat loss from a separate storage tank. The installed cost and expected maintenance are also worth including when comparing configurations.
Are combi boilers energy efficient?
Condensing models recover heat that would otherwise leave through the flue. A modulating burner can adjust its firing rate as demand changes, and cooler return water helps the unit spend more time condensing. Compare the manufacturer’s AFUE rating and the actual operating conditions of each model.
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