With a new energy efficient boiler? Test how the boiler works in different homes, from a flat to a home, using a system room. Feel free to share on social media, the more people the that know about the benefits the better – you never know you may save family and friends some money! Use our savings calculator to estimate how much you could save on your bills. Best of luck clearing up your drain and keeping it that way! Singapore, singapore (hq) e-mail. Absolute.