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Old 09-12-2021, 01:02 PM   #21
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Originally Posted by Marco Flamingo View Post
No antifreeze. My hydronic heat is in concrete slab on grade. Even when I'm gone for a month in the winter, the slab only cools down to the mid-50's. Because of the thermal mass in the house, we don't even drain the potable water when gone for months in the winter. Thermometer recorded the lowest temp in the house was mid-40's after three days below freezing (which is unusual for us). Hell would have to freeze over before I'd need to worry about antifreeze, but I'm keeping my eye on climate change.

You might want to check whether your boiler requires glycol. Most do for corrosion inhibiting, in addition to freeze protection.
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Old 09-12-2021, 01:06 PM   #22
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Originally Posted by Marco Flamingo View Post

I don't know if they make a plate heat exchanger small enough to replace the tube exchangers on my old Lehman. The other issue would be that the plate exchanger's efficiency is probably because of very close tolerances. I'm not sure how it would handle little bits of seaweed and seagull poop.
Single piece plate heat exchangers (that cannot be disassembled) can be tiny, almost palm sized. They are commonly used in home brewing or 4WD water heating.

I've used modular models for oil heating down to tissue box sized. Obviously these can be made smaller by simply using less plates.
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