Home » Blog

Condensing Boilers – Why are they more efficient?

November 3, 2014

We all expect to see a flue taking exhaust gases out of a working boiler, but unless you are using a condensing boiler it is also taking away your money.   One of the gases in the exhaust is steam, which carries unused heat energy with it out of the flue and out of your wallet. Condensing boilers convert much of this steam into water, releasing this heat energy into the boiler and into your home. This increases the energy efficiency of the boiler by more than 10%.

We all understand that to convert water into steam, we need to add heat. The opposite is also true. If we convert steam into water we can recover that heat. This heat energy is known as latent heat. This latent heat is retrieved from the steam and used to heat the boiler water in a condensing boiler. Much like a cold glass of water condenses the humidity in the air; a relatively cold return section of a boiler will condense the steam in the fluePrestige Stainless Steel Heat Exchanger gas. This happens when the water returning to the boiler is less than 130F.

Traditional boiler systems have avoided condensing the flue gas steam by keeping the return water temperatures above 130F. Traditional boilers are made from cast iron which will rust and fail if the flue gas steam condenses.   Condensing boilers are designed in aluminum and stainless steel to resist corrosion. Triangle Tube’s Prestige condensing boilers utilize a specialized grade of stainless steel to withstand the heat and corrosion in its condensing heat exchanger.

Prestige High Efficiency Condensing BoilerTriangle Tube’s Prestige Condensing Boiler is able to achieve an Annual Fuel Utilization Efficiency (AFUE) over 95% by recovering the latent heat of the flue gas. In addition, the Prestige boiler uses other advanced “green” technology such as modulation and outdoor reset. The Prestige boiler is designed to use either natural gas or propane and burns clean enough to meet California’ Low NOx emissions requirements.  Contact Jim Lavallee Plumbing & Heating to find out how the energy efficiency of Prestige Condensing Boiler can help lower your fuel bills.

Jim Lavallee Plumbing
Serving Eastern Massachusetts and the Boston area
Phone: Toll-free (888) 884-4122


(original article)

New Construction

  • Custom
  • Plan & spec
  • Design build


  • Kitchens
  • Bathrooms
  • Basement


  • Forced hot water
  • Radiant heating
  • Hydro air