Smart controls can help with that in fact, you could increase your boiler’s efficiency by an extra %! pretty nifty, eh? You are not looking to replace your current heating controls and your timer is not fixed to your current boiler. How can i get rats out of my house? If you're interested in real technical nitty gritty, why not take a look at a few of the many patents covering how kettle-like appliances work? here are four i've picked out, but you'll find lots more in the records. Radon mitigation systems: is your home safe? Source: which.co.uk - prices correct as of february . Would you like to leave feedback about this page? Launched in , reader's digest has built years of trust with a loyal audience and has become the largest circulating magazine in the world.