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Jaybird,
When I winterized for the year I blew out the lines with a compressor. That is a step farther than just opening up the low points. If you get all the water out then your lines will not freeze. Since I was doing it only once I then added the pink stuff as J&D stated about 2 1/2 gallons for the lines and then I put another half down each trap into the three holding tanks.
If you are comfortable getting all the water out by blowing out the lines and you have a compressor that is the cheapest way.
I have one concern running the electric heater. My concern is the warm air is not getting down into the sub-floor where the water pipes are located if it gets below 32 there then you have the problem. I have not seen the design but guess the water pipes now run parallel with the heating duct so it helps to keep them warm.
Thanks for reading and I hope I have helped.
Cheers,
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