why do you get condensation on double glazing

Open the bathroom window or use the extractor fan when showering. Keep the bathroom door closed at all times, to prevent water vapour from showers circulating around the flat. Use a cooker hood (venting directly to the outside) when cooking every litre of gas burned produces five litres of water vapour. Finally, every home would benefit from use of a dehumidifier. Use it on the low, economy setting all the time, but turn it up when a higher moisture load is introduced into the house such as showering, cooking, or bringing damp washing into living areas. Ebac is a popular British-made brand with a good record, and they are offering a 20 per cent discount to Telegraph readers. Call 0845 634 1392 and quote the promotion code ASKJEFF. Incidentally, following my answer about external condensation on window glass, reader David Broome has suggested the use of a water-repellent coating such as Rain-X rain repellent, which is sold in motoring stores for use on car windows.

I have no experience of this product myself, and would welcome readers experiences. Q. Further to your recent column on combi boilers, is it true that, at some time in the future, all replacement boilers will have to be combi boilers by law? Having taken in your views on the subject this is a rather alarming prospect. MS, by email
A. No, this is not true. All new and replacement boilers have to be condensing models, which are slightly more efficient because they extract some waste heat from the flue gasses (although any efficiency gains are probably cancelled-out by the short life expectancy of these boilers). However, there is no need for a new condensing boiler to be installed as part of a pressurised combi system, and there are no plans for this to become a requirement in the future. Condensing boilers work just as efficiently in a traditional indirect-pressure system, with a hot-water cylinder and cold-water storage cistern.

For some reason, many readers confuse the two words, combi and condensing, and that confusion is exploited by unscrupulous heating engineers and firms in order to sell combi boiler systems, which are much easier for them to install, and therefore more profitable. Q. Further to your recent discussions and solutions concerning heating and hot water, I have a further question. Two of my friends have had Megaflo systems installed. What is this and how does it compare with the combi and the traditional heating systems? SA, London A. Megaflo is one brand name for an unvented mains-pressure hot water cylinder. It works in much the same way as a conventional hot-water cylinder, being heated by the boiler, or by an electric immersion heater. The difference is that there is no cold-water cistern to provide indirect pressure to it.

Instead you are dependent on the mains pressure, and if this is poor it can lead to the same problems experienced by owners of combi boiler systems namely poor water flow to upper storeys, and interference with the flow when two or more outlets in the house are being used at the same time. Unvented systems are generally not advisable unless you have good mains pressure (at least 1. 5 bar) entering the property via a 22mm supply pipe. The cylinder also requires a yearly test and maintenance by a service engineer. If your house has an existing hot-water system fed by a cold-water cistern, then I cannot see any advantage in removing this and replacing it with an unvented pressurised system. If the main aim is to get a powerful shower, then an electric shower pump is a cheaper and easier option. Send your questions to Jeff at Property, The Daily Telegraph, 111 Buckingham Palace Road, London SW1W 0DT, or email askjeff@telegraph. co. uk.

Also visit Does double glazing eliminate condensation? Condensation forms when warm air is cooled. In the case of a window, the moisture in the air condenses on the glass forming what can be significant amounts of water. Where the window has only single glazing, the cool temperature on the outside transfers easily to the inside and condensation occurs rapidly. When double glazing is installed, there is much improved thermal insulation between the outside and inside. As a result, condensation is greatly reduced, creating a warmer, drier, healthier home. In a home that has a common level of humidity at 70%, and the temperature of the air inside the home is 20 C, then the following levels indicate the outside temperature at which the temperature of the centre of the double glazing would cool to the inside dew-point:

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