Condensing Boilers
Posted by: Ark Insulation Installers Category: Boiler Scheme, UK Comments: 0

The condensing boilers run on gas or oil and have been designed to help improve energy efficiency. This is done by converting water vapor condensation into heat, they are able to recover some of the lost heat from waste gases. The only difference between a condensing boiler and a non-condensing boiler is the amount of usable heat it produces, plus the fact they can achieve over 90% energy efficiency.

How Does a Condensing Boiler Work?

Your boiler will use either gas or oil as fuel and it will begin to burn when lit. As it does so, it inputs the heat from the burner into a primary heat exchanger. The hot air travels through the heat exchanger and is kept here for as long as possible to bump up the temperature. It will then take this heat away to your radiators.

The heat also travels through a secondary condensing area, which is something other types of boilers do not have. As it does so, the warm air condenses, causing droplets, or water vapor to occur -which are then collected and taken away to be disposed of via a drain. This is one of the main advantages of a condensing boiler as no other boiler will have this amount of efficiency.

Condensing boilers are designed to recover more heat before it is lost. In an older boiler, you could probably expect heat that leaves the flue to be over 200 degrees Celsius. With a newer, condensing boiler, it is reduced significantly to around 55 degrees Celsius. Condensing boilers are great at recycling that heat to increase the temperature of the cool water that returns.

The Advantages Of A Condensing Boiler

Condensing Boilers

The average UK household spends about 60 percent of their energy bill on heating their home. Add to this the hot water, and anything you can do to make this portion of your bill is going to make your financial position significantly better. According to the Energy Saving Trust, you could save up to £340 a year by switching to a new, condensing boiler for your home.

And it is not all about the money either. With all of us trying to do our best to reduce our carbon footprint, switching to an energy efficient condensing boiler could make a big difference to your environmental impact too.

How Does A Condensing Boiler Achieve Such High Efficiency?

The first thing to remember about conventional boilers and condensing boilers is the heat input from the burner is the same. Roughly 250-300 degrees Celsius.

It is important to understand how a conventional boiler works in order to compare the two.

A conventional boiler has one heat exchanger. Water enters the heat exchanger at the coldest point and collects heat leaving the heat exchanger and flowing off to the radiators and hot water tanks. The flue temperature can be anything up to 250 degrees Celsius. That heat is expelled into the atmosphere never to be used again..

The condensing boilers have two main heat exchangers. This time the water enters the secondary 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. The condense is mildly acidic (about the same pH as tomato juice) and is expelled to drain.

From there the water enters the primary heat exchanger to collect more heat before flowing to the radiators and hot water tanks. The flue temperature will be around 55 degrees Celsius. That means up to 200 degrees of heat is being transferred to your heating water, not expelled into the atmosphere. This means you save loads of money.

Interest Free Boiler

Condensing Boilers

Buying a pay later offer means that you can pay no interest if you pay your loan off early. This repayment option is the most popular for new combi boilers, system boilers, back boiler replacement and installations with new radiators.

Getting a new boiler on finance could be an option for homeowners looking for added flexibility for their purchase.

Buying a condensing boiler can be expensive, so if a one-off payment is not an option for you, we could introduce you to our finance lender who may be able to evaluate whether any other finance options are available to you.

To deposit an offer is an example of one of the options that may be available. With this offer, you may be able to avoid paying a down payment for your new boiler installation by financing the total price of the boiler and the installation spreading your payments over an agreed term.

Paying for a boiler on finance means you can spread the cost into manageable monthly payments, instead of paying for it all at once. 0% APR means you can buy a boiler, interest free boiler, with no additional charges  you will only pay for the boiler and its installation in your home.

Condensing Boiler Installation

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 evaporation, which would otherwise have been wasted.

In a condensing boiler, heat existing in the flue gasses can be captured and ‘recycled’ back into the heating system and used to preheat the cold water entering the boiler. During this process, the temperature of the flue gas is rapidly reduced from around 130℃ to 50℃.

Since 2005, it has become mandatory to install condensing boilers if your old boiler needs replacing. Condensing boilers significantly reduce carbon emissions and you can save up to 1,200 kg of carbon a year by installing one in your home.

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