"I bought the LP111 to replace the existing Drayton unit which , after years of good service, had seen better days. If you want something easy to install, this is it. I had it wired up and programmed within 15 minutes. It's super simple to set the on/off timer for the heating . It has 3 on/off settings so it's ideal for making sure it's on when we need it. I also really like the "boost"setting for when we get a cold snap, it puts the heating on for 1,2 or 3 hours without affecting the other settings or having to remember to switch it off. For the price, this unit is hard to beat."