On 31/07/2019 11:48, Andy Burns wrote:
Swer wrote:

Andy Burns wrote:
I wasn't suggesting anything lower than 20A

But that wont work with more than one fan heater per spur.

In practice, a 20A MCB will allow two 3kW heaters per circuit more or
less indefinitely, especially if they're cycling independently on their
thermostats, and assuming you don't live in a gaping barn.

And it doesn't matter if they are both at one end of a ring with a 20A
breaker.