Boilers & Hydronics

Bosch Thermotechnology Corp.: Modulating Gas Condensing Boiler

With four models supplying from 84,800-214,800 Btuh, and cascades of up to 16 units for even higher outputs, the Buderus GB142 modulating gas condensing boiler can provide sufficient heating comfort for any type and size of home or small to medium business, said the company.


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Boilers, Water Heaters Efficiently Evolve

Manufacturers Aim For Higher Efficiencies, Smaller Footprints

When it comes to boilers and water heaters, manufacturers are sensing an ongoing trend — the move to higher-efficiency models.


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Boilers, Water Heaters’ Efficiencies Rise

Manufacturers Aim for Efficiency, Ease of Use

Water heater and boiler manufacturers are diligently introducing high-efficiency systems into the marketplace with the goal of making life easier for both the contractor and the consumer. 


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Contractors Discuss Strategies to Sell Boilers

System Knowledge, Return on Investment Headline the Selling Process

These days, it’s not just going into a house and installing a cast-iron boiler. Today’s units offer consumers multiple choices regarding efficiency and performance. 


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Heat Transfer: Nature Versus Math

Formulas and Assumptions Don’t Always Predict what Happens

The following formula has been around the North American hydronics industry for a long time: Btuh = 500 x gpm x delta T. It can be used to estimate the rate of heat transfer into or out of a device that has a stream of water flowing through it at a known flow rate, and with a measured temperature change between the inlet and outlet of that water stream.


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Rinnai America Corp.: Residential Combi Boiler

Designed for smaller residential applications with up to 1.5 bathrooms, the E50C Condensing Combi Boiler has been added to the E Series. 


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You Don’t Need a Weatherman

You Do Need Knowledge of the Quirks of Older Heating Systems

Unless you get an older steam system working as it should be working, sensors and software will just let you know that something is wrong.


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Distributor Info Adds to HVACR Equation

Unitary, Mid-Year Reports Showcase Equipment Trends

The “HARDI Unitary HVAC Market Share Report” provides market share data and analysis detailing unitary sales based on product efficiency for both ducted and ductless cooling equipment, as well as furnaces and boilers. 


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Missing: Self Buffering & Low Head Loss

Considering Circulators and Head Loss in Modern Boiler Systems

In newer modulating/condensing boilers, many of their heat exchangers had to sacrifice two very desirable qualities in the interest of being small and light.


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Grand Hall USA: Residential Hybrid Water Heater

Adding 20 percent more Btu than its GU100 Model, the Eternal GU120 Model provides homeowners with hot water for up to two applications simultaneously. 


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Scenes from the 2014 World Energy Engineering Congress in Washington, D.C.

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NEWSMakers: Kari Arfstrom

Kari Arfstrom, executive director of the HVACR Workforce Development Foundation, talks about the upcoming HVACR & Mechanical Conference. Posted on Jan. 23.

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