Best Combi Boilers In June 2025

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Looking for the Best Combi Boilers? Hey, we have got something for you here!.

To help you in your search, we have completed this list of the Best Combi Boilers.

Top Rated Best Combi Boilers Of 2025

Rank	Product Name	Score
1	CGt - 133,000 BTU - Hot Water Combi Boiler - NG - 82.1% Buy Now	9.7 Buy Now
2	Noritz NRCB199DV-LP Indoor Direct Combination Boiler (Standard Vent Convertible) with Built-in Pump, max Buy Now	9.5 Buy Now
3	Noritz NRCB180DV-LP Indoor Direct Combination Boiler (Standard Vent Convertible) with Built-in Pump, max Buy Now	9.1 Buy Now
4	Rinnai i150SN Condensing Gas Boiler, i150SN-Natural Buy Now	8.8 Buy Now
5	Noritz CB199-DV-NG Combi Boiler Buy Now	8.6 Buy Now
6	Rinnai M060SN Q-Series Condensing Boiler, M060SN-Natural Gas Buy Now	8.3 Buy Now

1. CGt - 133,000 BTU - Hot Water Combi Boiler - NG - 82.1%

2. Noritz NRCB199DV-LP Indoor Direct Combination Boiler (Standard Vent Convertible) with Built-in Pump,

• Superior temperature stability for domestic hot water
• Clean burner
• Noritz accessory
• Easy to install with new wall bracket
• Simultaneous domestic hot water and heating

3. Noritz NRCB180DV-LP Indoor Direct Combination Boiler (Standard Vent Convertible) with Built-in Pump,

• Easy to install with new wall bracket
• Clean burner
• Noritz accessory
• Simultaneous domestic hot water and heating
• Superior temperature stability for domestic hot water

4. Rinnai i150SN Condensing Gas Boiler, i150SN-Natural

• The i150sn condensing gas boiler heat-only model offers the comfort of whole home heating.
• Rinnai i150sn - natural gas condensing boiler
• Convenient control options with the ability to connect two zone pumps to the pcb.
• Excellent operational performance with 95% afue efficiency and energy star most efficient certified.
• This heat-only model offers an outdoor reset to optimize your home heating performance and features an integrated modulating pump, with an outdoor reset sensor (in the box)

5. Noritz CB199-DV-NG Combi Boiler

• Max flow rate: 9.2 gpm
• Energy factor: 0.95
• 11:1 turndown ratio
• Min gas input: 18k btu, max gas input: 199k btu
• Max gas input for space heating: 120k btu

6. Rinnai M060SN Q-Series Condensing Boiler, M060SN-Natural Gas

• Flexible venting options with approved concentric, pvc, cpvc, stainless steel, polypropylene (rigid and flex), for single-pipe exhaust, room air and two-pipe systems
• Features an integrated modulating pump, and outdoor reset sensor (in the box)
• Stainless steel primary boiler heat exchanger for unmatched performance and durability, copper nickel integrated dhw plate heat exchanger
• Compact wall-mounted design saves space over traditional boilers
• Rinnai m060sn - natural gas condensing boiler