If you’ve ever sat by a campfire, then you probably know that you actually only feel a small percentage of the heat generated by it. Most of the fires heat is lost into the air. Before Condensing Boilers, something kind of similar used to happen – in that most of the heat generated by the boiler was lost through the flue. One of the big benefits of condensing boilers is their ability to reclaim that heat that would otherwise be lost through the flue.
But if your boiler is set at the wrong temperature, then you’re still not getting its full efficiency. That is why one of the most asked questions we get is “What is the best temperature to set a condensing boiler at?”
For maximum efficiency, the correct boiler temperature setting is 60°C – It cannot be set lower than this or you could increase the risk of contracting bacteria from the Domestic Hot Water that can cause Legionnaires’ disease.
With condensing boilers, the temperature of the water returning to the boiler must be below 55°C for heat recovery by condensation to take place. If the return temperature exceeds this, the whole purpose behind installing a condensing boiler, and the benefit of reclaiming latent heat from the flue gases, is all but lost. Ideally, the return temperature should be as low as possible, but not at the expense of inefficient heating throughout the home.
How do you know if your boiler is condensing properly or not…? Well there’s no sure way of knowing really without calling a plumber out to test it. And even then, setting the right boiler temperature to ensure that it heats your home properly can be a guessing game. This often results in the boiler being set too high for the condensing process to take place and defeating its main purpose.
How can Oxyvent help?
For maximum efficiency, Oxyvent stringently obeys the manufactures recommendations of setting the boiler temperature at 60°C. It also operates the radiators using its patented 2°C Delta T, which makes sure the return water temperature to the boiler is 52°C, which is 3C° below the manufactures recommended 55C°. This ensures the boiler is always in full condensing mode and can save you 30% in fuel compared to a boiler that is not condensing properly. Oxyvent is the only system in the world that keeps a boilers return temperature below 55°C in full condensing mode. Saving you money and providing hot water at the recommended temperature, all radiators heating uniformly and increases the comfort level of your home by producing higher temperatures at floor level.
Oxyvent really are leading the way in heating technology.
Independent Test Results show significantly higher condensing with Oxyvent.
Oxyvent lower operating temperature has two key characteristics which indicate that it is operating more efficiently. The maximum rate of heat transfer for each boiler with Oxyvent @ 60°C scenario are notably higher than that without Oxyvent @ 70°C. For the with Oxyvent @60°C case the peak heat transfer rate is over 13kW, opposed to 8.8kW for the without Oxyvent @ 70°C case, which means that more heat is being absorbed from the combustion gases into the water stream within the heat exchanger of the boiler. This would be partially due to the fact that the average temperature of the water is lower, though most likely predominantly due to the boiler operating in condensation mode.
There is significantly more condensate generated for the with Oxyvent @ 60°C case due to the water entering the boiler is below the dew point. As a result, there is additional heat absorbed from the combustion gases which would account for the increased rate of heat transfer as well as the drop in the exhaust gas temperature.
The boiler with Oxyvent @ 60°C generates 3.5 times more condensate. This strongly suggests that the boiler is more efficient with Oxyvent @ 60°C scenario.
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We answer your questions
Where Underfloor Heating is installed with a gas or oil boiler, hot and cold patches on the floor are quite common. It can get very uncomfortable when the floor overheats. What can we do about it?