PV Solar Panels Water Diverter

Hello

This is coming from someone who isn't remotely handy so my expectations might have been way off.

I recently had a small Solar PV setup installed and my major expectation going into it was that anything generated would go into the house.

The priorities were to be

• - 1) immediate use (ecar, lights, cooker, appliances ...)
• - 2) small Battery system (3.6kw)
• - 3) hot water
• - 4) the grid (with this option accounting for a small fraction of the power generated, not the 70% the system is reporting).

1 & 2 are both good. My question comes from step 3. When I included the Water Diverter at the outset I expected that this would be the water on tap, sure, but more importantly would be the water running through the radiators. These Radiators were to be the major ROI / energy sink that i could rely on, however the reality has (very) hot water on tap but nothing going through the radiators.

Bottom line, Is electrically heating radiator water a thing or was I mistakenly conflating my (our oil fired) central heating with Solar Panels?