Jeff Howell: do we need a new boiler? The advantage of a low-loss header pipe layout is that the boiler can be set up to operate at a steady flow rate and flow-and-return temperatures, which can improve efficiency, especially for modern condensing boilers. This has the potential to reduce fuel costs - perhaps up to five per cent or so. The "Magic Heating Box" is advertised as reducing bills by 30 per cent to 50 per cent, however, which is highly fanciful and, indeed, unachievable according to the laws of physics. You say you need to make a decision, "over the next couple of days," which indicates you are being put under pressure by a salesman to sign up for this very expensive gadget. That alone should warn you off. I was puzzled that anyone could possibly charge £13,000 for such a device until I checked the name Green Home Energy Ltd, and found that one of its directors is Thomas Callaghan, whose many company appointments include the now-dissolved Simplee Solar Ltd, also of Dorset, which I mentioned in this column in July 2011. Callaghan and his partner Lee Comer had been fined £40,000 plus £27,000 costs for, "supplying and offering goods to which a false trade description applied." After that judgment, a spokesman from Dorset Trading Standards was quoted as saying, "I think there is a positive attitude. Directors Lee Comer and Tom Callaghan are listening to what we have to say and responding. Judging by your letter, it sounds as though Callaghan might have a bit more listening and responding to do yet. Not any old boiler Q: We're planning a kitchen extension with utility room which will mean moving the boiler. It's a conventional boiler that was fitted well before we bought the house in 1997, so having read your columns I don't want to get rid of it. Can we keep the boiler if we move it to a new position, or will we be forced to buy a new one? AR, London A: Yes, you can keep your existing boiler and move it to a new position. The lobbying groups that do their best to influence government energy policy have not yet managed to outlaw a householder's right to relocate his own boiler, although I'm sure they would love to do so. Moving a conventional boiler involves re-routing the gas supply, the primary water flow and return, plus two electrical cables - the one providing mains power to the boiler and pump, and the one connected to the room thermostat. Anything involving a gas connection has to be done by a GasSafe-registered heating engineer, and you might have to buy a new flue assembly if the old one won't fit, or if it gets damaged when it is removed from its previous position. Send your questions to Jeff at Life, The Sunday Telegraph, 111 Buckingham Palace Road, London SW1W 0DT, email askjeff@telegraph.co.uk. Also visit Ask Jeff