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A friend of mine has a greenhouse with poly tubing under the sand to keep his plants alive through the winter. He’s concerned that when he’s away, if the boiler shuts down, the water will freeze and damage the boiler.
The poly tubing says not to use any petroleum based antifreeze.
What’s safe to use. He’d like something that won’t hurt the plants if he springs a leak but will live with any antifreeze that’s safe for the boiler and tubing.
Replies
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A friend of mine has a greenhouse with poly tubing under the sand to keep his plants alive through the winter. He's concerned that when he's away, if the boiler shuts down, the water will freeze and damage the boiler.
The poly tubing says not to use any petroleum based antifreeze.
What's safe to use. He'd like something that won't hurt the plants if he springs a leak but will live with any antifreeze that's safe for the boiler and tubing.