How do smart valves in a central heating system save energy and therefore money?

Question

If each radiator calls for hot water when it needs it, won’t this be often and at different times, and therefore be a roughly similar energy cost to doing it less frequently but all at once?

In: 1

Answer 1

Keeping the entire house warm all the time takes more energy than keeping certain rooms warm when you need them.

Less heat in the house means less heat can escape, meaning you need to burn less fuel to keep the rooms warm.