Boiler Dry Cycling

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It is also worth noting that this dry cycling occurs most often when the boilers are under lighter load conditions or due to existing building controls. Once the heating system is satisfied the boiler s will turn off.

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The boiler is currently at set point and is in stand by mode as further heat is not required from the system load.

Boiler dry cycling. Up to 10 25 of a boiler s gas consumption can be wasted due to dry cycling. For building operators that can equate to thousands of pounds of unnecessary spend and tonnes of unnecessary carbon emissions. Dry cycling is caused by a boiler s standing losses.

Due to the ambient radiated heat losses together with the flue draught heat losses standing losses the boiler will naturally cool down over time which may cause the boiler temperature controls to instruct the boiler to re fire and return the boiler back to set point. What is boiler dry cycling. Boiler dry cycling is a symptom of standing losses heat lost via the boiler casing and flue.

As the temperature drops below the setting on the boiler s thermostat the boiler will fire to recover its standing losses yet the building requires no heat. It is the repeated firing of the plant to maintain its internal water temperature when there is actually no true heating demand from the building it serves. Unfortunately one area of control that is not addressed and often goes unnoticed is boiler dry cycling.

Smart technology for commercial boilers boilers can waste fuel continuously in order to remain at their set point temperature. Given that boiler dry cycling can wastefully account for as much as 25 of fuel consumption based on figures from over 90 projects in the last five years and that this heat is not utilised by the building system load this is clearly an area that requires attention. Naturally the boiler cools down.

Better insulated buildings with lower heat loads can also exacerbate this situation especially when the boilers have over capacity to meet extreme cold weather that is only experienced on a few days a year.

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