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Enabling fuel savings of up to 15%, Weather Compensation utilises a simple outdoor sensor and some clever controls to adjust the temperature inside your house depending on the temperature outside.

 

Viessmann weather compensation

 

Weather Compensation controls work by ensuring that the boiler burns the exact amount of fuel required to match the heat lost from the building. The house will always be at the desired temperature and will never be too hot or too cold.

Weather Compensation significantly improves efficiency and is ideal for the UK climate. For two thirds of the year, the boiler will provide only a fraction of its maximum heat load, which means the boiler temperature is reduced for the majority of the year, while still maintaining a constant room temperature of 20ºC. Only around 15% of the homes total heat energy usage is consumed during winter temperatures between -3 to -10ºC.

Available with our Vitodens range of condensing boilers, Weather Compensation not only allows you to save up to 15% more fuel each month, it also ensures you will enjoy an incredibly comfortable home with a pleasant indoor temperature - whatever the weather.

With ever increasing fuel bills and the need to be as eco-friendly as possible, it's important that we all look for ways to save fuel and carbon emissions - and money! All gas boilers now have to be condensing boilers and this represents a huge step forward in environmentally friendly heating, with fuel savings of up to 35% compared to conventional boilers. But there is a way to save even more - up to 15% in fact, with just a simple outdoor sensor and some very clever Weather Compensation controls, available with the Vitodens range of condensing boilers. For a relatively small investment you'll not only save up to 15% more fuel each year but you'll also enjoy an incredibly comfortable home -with a pleasant indoor temperature - whatever the weather.

Heating - the basics

Our homes need heating, to replace heat lost through the walls etc. The colder it is outside, the more heat is lost and the more we have to heat the building, to replace that heat, especially in the winter when the heat loss is at its highest level. This basic explanation is fundamental to understanding how an outdoor weather sensor can help to heat your home in a more efficient and cost-effective way. Weather compensation controls work by ensuring that the boiler burns the exact amount of fuel required to match the heat lost from the building. The house will always be warm (at the desired temperature) and will never be too hot or too cold. Weather compensation significantly improves efficiency under partial load conditions and is especially relevant for the UK climate, as for two thirds of the year the boiler will provide only a fraction of its maximum heat load, which means the boiler temperature is reduced for the majority of the year, while still maintaining a constant room temperature of 20ºC. Only around 15% of the homes total heat energy usage is consumed during winter temperatures between -3 to -10ºC.

Conventional controls

Traditional heating systems have a room thermostat indoors and this is the sequence that follows a drop in temperature.

 

 

In the above example, it isn't until stage 4 that the boiler gets any 'feedback' and is able to respond to changing conditions. The chances are that at this stage, the householder will be feeling the cold and will turn the thermostat up even further - wasting even more fuel. If the outside temperature rises, the boiler will not respond until the  rooms have become uncomfortably warm - so in addition to adjusting the thermostat, there'll probably be the temptation to open some windows, releasing more heat and wasting more energy.

With a weather compensation system, the boiler is able to respond at stage 1 - see opposite.

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