New combination boiler satisfies multiple hot-water needs

June 7, 2017

A new product enables those in single- and multifamily homes to avoid not having enough hot water for domestic use and space heating.

The new combination boiler from Noritz is a year-round, whole-building solution that delivers hot water to both plumbing and hydronic heating applications.

This means having one unit doing the work of two — and more resourcefully at that, according to the company.

The unit performs at a 95 percent AFUE (annual fuel utilization efficiency); that is, 95 percent of the fuel consumed goes to heating the water to the preset temperature, as opposed to being lost through the flue. This fuel-saving performance meets Energy Star Most Efficient standards, meaning that, with the combination boiler, owners qualify for various state energy rebates around the country to offset the initial cost.

On the space heating side, the combination boiler accommodates a host of applications, including radiators, baseboards, low- and high-mass radiant heating (i.e., in-floor, snow melt, etc.) and air handlers.

Two models are available for different levels of demand:

  • The CB180DV has a maximum input Btuh of 180,000 for hot water and 100,000 Btuh for space heating.
  • The CB199DV has a maximum input Btuh of 199,000 for hot water and 120,000 Btuh for space heating.

Other combination boiler features:

  • Weighing only 90 pounds, the wall-hung combination boiler is also significantly lighter than a traditional boiler, requiring only one installer to do the job instead of two or more. Its compact size allows it to take up as much as 80 percent less space than a traditional floor-standing boiler and water heater.
  • The combination boiler allows users to enjoy stable temperatures in your shower and other water uses. A flow control valve ensures consistent temperature for domestic hot water demand, regardless of incoming water temperature.
  • The units allow different temperature settings for the domestic hot water heating and space heating applications. For domestic hot water, temperatures range from 90 to 140 degrees Fahrenheit. On the space heating side, the range is 100 to 180 degrees Fahrenheit.
  • Both models contain three superior-grade stainless steel heat exchangers, as well as scald prevention for domestic hot water safety.
  • The use of plastic venting materials — rather than the stainless steel venting required by non-condensing water heaters — substantially lowers costs by reducing installation time as well as the cost of the piping materials.
  • The combination boiler can deliver up to 4.5 gallons per minute of domestic hot water at 77 degrees temperature rise, nearly double that of competitors.

For more information, visit

Topics: Building Owners and Managers, Energy Saving Products, ENERGY STAR, Tankless Water Heaters, Technology, Water Heating Strategies - Energy Efficient Water Heating / Heaters and Boilers, Water Saving Strategies and Devices

Companies: Noritz

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