Quote:
Originally Posted by bobkatfly
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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I have a seasonal cabin behind my house and it is fed from the house. When it was put in there was too much ledge so the water line to the cabin is only about 1 foot under the ground.
At the house, I connect compressor to the line that feeds the cabin and blow out everything, including the hot water heater. I close the faucets and then shut down the compressor. Every year when I start it up in the spring there is still air pressure in the lines. The first time that happened it was a surprise to me.