How does a condensing gas water heater work?
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Video answer: Rheem prestige® series condensing tankless water heaters
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In a condensing heater, a draft-inducing fan pushes air and fuel into a sealed combustion chamber inside the tank (see Figure 1). As the fuel burns, combustion gas is exhausted through a secondary heat exchanger — a coiled steel tube submerged inside the tank… All are far less expensive than stainless steel.)
Video answer: Condensing vs non condensing hot water heaters
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In a condensing boiler, the water is condensed inside the boiler so more energy can be extracted; in a conventional boiler, the water escapes as vapour and the energy is lost.
A condensing boiler has two main heat exchangers. This time the water enters the secondary (and condensing) chamber first. Picking up latent heat from the hot flue gases as they cool. The moisture in the gases condenses into droplets that form at the bottom of the heat exchanger.
A condensing boiler runs on gas or oil and has been designed to help improve energy efficiency. This is done by converting water vapor condensation into heat; they’re able to recover some of the lost heat from waste gases.
How Condensing Boilers Work A boiler utilises fuel or electricity to heat water for central heating and domestic hot water production. Most modern boilers operate only when called upon by the heating or hot water system
Condensing boilers are water heaters fueled by gas or oil. They achieve high efficiency (typically greater than 90% on the higher heating value) by condensing water vapour in the exhaust gases and so recovering its latent heat of vaporisation, which would otherwise have been wasted.
Condensing gas tankless water heaters produce continuous, on-demand hot water for your home and can provide instant hot water when the model includes a recirculation pump.
Some very high efficiency models use a secondary heat exchanger that extracts more heat from the combustion gas, cooling it to the point where there is condensation– hence these types of heaters are called “gas condensing.”
Condensing water heaters pull heat from the exhaust, cooling it to much lower temperatures. This means cheaper materials can be used for the ventilation system. Overall efficiency in a condensing model is approximately 90 percent, which makes them one of the most efficient choices you can make.
Video answer: Introducing the high efficiency gas tankless water heater…
