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BOILERS


Busting weather compensation myths


New Boiler Plus regulations make weather compensation more desirable than ever, but some misguided beliefs about the technology need correcting. Darren McMahon, marketing director at Viessmann, goes myth-busting


ince April 6 it has been a legal requirement for all new gas combi boilers in England to have at least one of the four ‘Boiler Plus’ energy-saving features: flue gas heat recovery, or a smart thermostat with automation and optimisation, or load compensation, or weather compensation. Any combination of these is permissible, but if you’re opting for only one, which should it be? In the experience of Viessmann installers and customers, weather compensation is a great choice and Viessmann has recommended and worked with the controls across its Vitodens boiler range for many years. Weather compensation is easy to install and reduces gas consumption significantly - by anything from 10 to 15% when added to a boiler, and by up to 30% when replacing an old boiler with a new one with weather compensation. Unfortunately, however, some installers are wary of weather compensation because of certain stories they’ve heard. Now that the Boiler Plus legislation is upon us, it’s time to bust those myths.


S


Myth 1: Weather compensation is not suitable for older buildings. Yes, older buildings do tend to leak more


heat than modern ones, which can make greater demands on a boiler. And yes, weather compensation generally runs the boiler at lower flow temperatures in order to improve the condensing function and efficiency – but the boiler is still able to run when necessary at maximum temperature, which typically only means the coldest days of the year. The installer has a number of settings options to choose from, to allow the heat curve to be adjusted to suit the building.


Myth 2: You must have a north-facing wall for a weather compensation sensor. A north-facing wall is ideal because it’s shaded and the sensor’s measurements won’t get affected by direct sunlight. But north-east and north-west facing walls usually also have shaded areas suitable for the sensor. And if it’s necessary to use an east-, west-, or south-facing wall, the sensor can often be located in the shaded recess of a window-frame or window- reveal. In the most extreme circumstances, the sensor can be shaded beneath a purpose-made cover.


Myth 3: You need new radiators. Not true. Because most boilers are installed as replacements, they get


Customers win with weather


compensation. It reduces gas consumption by


anything from 10 to 15% when added to a boiler, and by up to 30% when replacing an old boiler with a new one with weather compensation


connected to systems where radiators have traditionally been over-sized. If the previous boiler could heat the building with those radiators, the new boiler with weather compensation will also be able to.


Myth 4: The boiler’s maximum flow temperature is reduced. Again not true. Although weather


compensation prevents the boiler from consuming gas needlessly when maximum flow temperature isn’t required, it also instructs the boiler to operate at maximum temperature when needed.


Weather compensation is easy to install. Viessmann has recommended and worked with weather compensation controls across its Vitodens boiler range for many years


Myth 5:Weather compensation is difficult to set up. It could hardly be easier! The sensor simply has to be attached to the outside wall by one or two screws; a wire from the sensor clips into two ports on the boiler control board (and the wire is low-voltage, so there’s no need for an electrician); and the boiler knows when the weather sensor is attached and automatically adjusts to weather compensation mode. All Viessmann Vitodens boilers, not just


combis, have weather compensation software built into the controls and, since the introduction of the Boiler Plus regulations, all combis now come with the sensor in the box, at no extra cost.


36 May 2018


www.heatingandventilating.net


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