I was thinking about insulating my WVO tank...has anyone else done this??

I really would like to stick with coolant heat only, but ultimately if I need to go with an electric heater to get my temp. up I will...

Maybe I should add a FPHE to the system?....I was reluctant to use one because I have seen them leaking coolant into the WVO and destroy the IP.
I made a homemade heat exchanger by coiling some aluminum tubing around a coolant chamber made of 1 1/2" pipe then insulating it.

Also.....Where is everyone installing their WVO temp. sending unit? Before or after the splitter valve???

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1981 240D