Both let you control your heating from your phone, and both are good. If you have a hot water cylinder, Hive usually makes more sense. If you want automatic room-by-room control, Tado is hard to beat.
When sludge is the problem, yes. A power flush brings cold radiators back to full heat and protects the boiler. When sludge isn't the problem, it's money you don't need to spend. Here's how to tell.
If you've got a mains pressure hot water cylinder and water is dripping from a pipe outside, or into the funnel next to the cylinder, a safety valve is opening. It's telling you something needs looking at.
For most homes with one bathroom, a combi. For homes where two showers or baths are used at the same time, a system boiler with a hot water cylinder. Here's how to tell which you are.
A gas safety check every year, a copy to your tenants within 28 days, records kept for two years and a carbon monoxide alarm in every room with a fixed combustion appliance. Here's the full picture, in plain English.