Smart controls can help with that in fact, you could increase your boiler’s efficiency by an extra %! pretty nifty, eh? Yes there are other solutions but we will be required to visit and survey the property. Used the whole bottle overnight to unblock a slow running bathroom (bath and loo) pipe water now runs freely - exceeded my expectations! Call our gas safe engineers on. Our buyers are doing it because of the independent survey report, which recommends it despite.