My south facing tiled bungalow roof needs refurbishment. Does anyone have experience of integral solar pv tiles installed on the sunny side of the roof?

One example of the style under consideration is

http://www.solarcentury.com/uk/c21e/...ar-plain-tile/

ie these panels are installed in place of the tiles - they are NOT the type of pv panel which sits on top of an existing slate/tile roof.

One option under consideration is to ignore the FIT tariff & simply use the pv tiles to generate watts (via an inverter) to power an extra immersion heater, completely bypssing the house 240V elec supply.

My focus at the moment is in building/installation/durability/engineering aspects etc - NOT economics!

Economics will be considered once one or more feasible options have been established.

TIA for any insights.