When I lived in Wolfeboro the house was on a slab. Same situation as you. We winterized every year by draining the tank through its drain valve and then pressurizing the system with a compressor through an outdoor spigot (with all the faucets open of course). Never had an issue.
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Bob F
Amherst till the big 66 comes (made it!)
Winter Harbor/Mirror Lake till the big guy comes
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