Condensing Your Carbon Footprint

Condensing Your Carbon Footprint


Whether or not you’re tired of hearing about the climate change and reducing our carbon footprint, it is a change that we should all be embracing not only for the environmental benefits but also the financial ones too.


UK buildings account for half of the nations’ greenhouse gas usage, between 1970 and 2014 gas consumption has increased from 4.7 mtoe to 8.0 mtoe and with energy prices continuing to rise with no sign of a reduction, it’s important to remember that if we cannot reduce the price of energy then it’s important that we reduce the amount that we use in order to gain those all-important energy savings.


Condensing unit heaters are an ideal solution that can deliver just that. An example would be Combats Eco Range of Condensing Unit Heaters, which is said to perform with up to 109% Efficiency. And low NOx < 30ppm and C0 < 5ppm


There are various types of condenser units within the HVAC Industry, air cooled is one option. This is when the condenser is located outside the unit and cooled by the surrounding air. A good example of this is upright freezers and residential packaged air conditioning units.

You also have water cooled. This type of condenser requires the installation of a cooling tower to conserve water commonly used in swimming pools and for air conditioning units. The condenser is from shell and tube type, this has refrigerant that flows along the side of the tube and cooling water alongside the shell side. You have to have a continuous amount of water to these units to maintain functionality.

There is a system that condenses hot gas by exposing it to a stream of cold water this is called evaporative condensing. This is caused by heat transfer that takes place as the water that moves over the gas evaporates and creates a vapour


Then you have the Eco Condensing Unit Heaters that creates condense when the fan blows across the heat exchanger which cools the gases resulting in the creation of condense.


How do the condensing heaters work?


The pilot fires, the internal control of the heater looks the leaving air temp set parameter of the heater as determined by the user, for identification of the required leaving air temperature. If a high fire is required the burner will trigger the high fire setting.

When the predetermined leaving temperature has been reached the burner will modulate down to a low fire setting to maintain the temperature that leaves the heater to heat the room.  When the burner is in low fire mode condense will form more freely as the exhaust gases fall below dew point. The condensed fluid is then contained within the condense trap, situated on the rear of the heat exchanger coil.

The condensed liquid is then drained into a device that has been designed to detect over fill of the condense. Should a blockage occur and the condense backs up in the condense line to drain, this is detected by the device and sends the heater to lockout. This is a safety feature designed to ensure that the condensed liquid does not fill the heat exchanger.

The heaters are designed on drum and tube technology with a drum and tube heat exchanger, with the drum situated on the bottom and the tube at the top that acts as a secondary heat exchanger.


These units utilise a premix burner that operates as a modulating combustion airflow which regulates gas pressure through the valve. This works in addition with the use of a hi/low burner to remove as much heat as possible from the heat exchanger so that the wasted heat held within the exhaust gases is then extracted from the heat exchanger.


Zero Governor means that the faster that the fan runs the more gas is combined with the air supply. The burner runs from a burner run signal and the internal logic controlled by the leaving air temperature sensor within the heater.


In addition to offering a more efficient heating option the ECO heater, supplied By Combat HVAC Limited is the smallest on the market with a breadth of 645mm on all units and heights ranging from 690mm to 845mm.


Business that are considering a more energy efficient, environmentally friendly system that complies with future regulations that could not only save you money on your fuel costs, but save on all important workspace then they could benefit from the installation of a ECO condensing  warm air unit heater.