J Hunter

I have recently had solar panels installed and the contractor is recommending a diverter for the immersion heater so I can use the solar panels to heat the water - particularly in the summer. With the remote digital display and installation this comes to about £500.00. My question...... for about £30.00 (plus installation costs)could you not install an Immersion timer with overide/boost facility which would give you more or less the same result without the large cost?? Just dont feel I will ever recoup £500.00 on my immersion - I expect in the winter we will have to revert to heating our water with oil. I would appreciate any thoughts - what will I gain for another £400??? Thank you