10 Best combi boilers

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Last Updated: 11-30-2025

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NRCB180DV 180,000 BTU Combi Boiler (NG)

Generic

9.8

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Noritz NRCB199DV-LP Indoor Direct Vent Combination Boiler (Standard Vent Convertible) with Built-In Pump, Max 199, 900 Btuh Dhw, 11.1 Gpm, 120, 000 Btuh Space Heating - Propane

Noritz

9.6

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Best Value

Combi Boiler CH 150K BTU/DHW 199K BTU

Rinnai

9.5

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Combi Boiler CH 120K BTU/DHW 199K BTU

Rinnai

9.2

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Combi Boiler CH 90K BTU/DHW 199K BTU

Rinnai

9.1

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Noritz NRCB180DV-NG Indoor Direct Vent Combination Boiler (Standard Vent Convertible) with Built-In Pump, Max 180, 000 Btuh Dhw, 9.8 Gpm, 100, 000 Btuh Space Heating - Natural Gas

Noritz

8.8

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NEW Rinnai RXP199iN Condensing Smart Sense Natural Gas or Propane Tankless Water Heater, Indoor or Outdoor Water Heater, Up to 11.1 GPM, 199,000 BTU, with Recirculation Pump

Rinnai

8.6

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IKONIC RTGH-SR11i 199,000 BTU Tankless Water Heater

Rheem

8.4

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FOGATTI Natural Gas Tankless Water Heater Indoor - Max 7.5 GPM 170,000 BTU, CSA Certified Compact Design On Demand Instant Hot Water Heater - Instagas Comfort 170S Series

FOGATTI

8.2

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I series Combi Primary Secondary Heating Kit

Rinnai

8.1

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NRCB180DV 180,000 BTU Combi Boiler (NG)

Noritz NRCB199DV-LP Indoor Direct Vent Combination Boiler (Standard Vent Convertible) with Built-In Pump, Max 199, 900 Btuh Dhw, 11.1 Gpm, 120, 000 Btuh Space Heating - Propane

Combi Boiler CH 150K BTU/DHW 199K BTU

Combi Boiler CH 120K BTU/DHW 199K BTU

Combi Boiler CH 90K BTU/DHW 199K BTU

Noritz NRCB180DV-NG Indoor Direct Vent Combination Boiler (Standard Vent Convertible) with Built-In Pump, Max 180, 000 Btuh Dhw, 9.8 Gpm, 100, 000 Btuh Space Heating - Natural Gas

NEW Rinnai RXP199iN Condensing Smart Sense Natural Gas or Propane Tankless Water Heater, Indoor or Outdoor Water Heater, Up to 11.1 GPM, 199,000 BTU, with Recirculation Pump

IKONIC RTGH-SR11i 199,000 BTU Tankless Water Heater

FOGATTI Natural Gas Tankless Water Heater Indoor - Max 7.5 GPM 170,000 BTU, CSA Certified Compact Design On Demand Instant Hot Water Heater - Instagas Comfort 170S Series

I series Combi Primary Secondary Heating Kit

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