Dear ajs heating
Sounds like you don't know either!
Dear fuzzy
Nice idea but the system comes pre-plumbed and pre-wired and I'm not sure the heaters are designed to come on separately. The guy that installed it for me installed a 3kW timer but these keep going faulty. I'm on my third timer now in 12 months so I'm guessing that the load is burning them out.
DH