Why not subscribe to our newsletter to hear about upcoming news and offers and get 10% off your first order? Pre purchase visual inspections. The pictures above are of an oil fired system installation in ruthin, denbighshire. The least reliable brand is more than three times as likely to break down, compared to the best. May be used for some service, cannot be combined with other offers. If you are to purchase an older property then getting a home buyer’s drain survey really is recommended.