I need some help choosing recirculating pumps.
I'm designing my hydronic heat system around a central thermally isolated coolant (heatant?) repository, which I will transfer heat into from multiple sources (diesel heat, PV load dump, later possibly engine heat or direct solar).
I'll extract heat for water, recirculating shower heat loss supplement, floor heating and water-to-air heat exchangers. Later possibly also for engine heat.
The coolant itself will be a regular glycol based fluid.
So, ideally I'd like to have a low power, low pressure, low voltage (12 or 24VDC) pump that is coolant resistant. I could spring for 120V if I had to, but I prefer a system that requires no AC to be always on.
On Amazon you can buy a regular household recirculating pump for $60 or so, and that would probably work, but I have no idea if the seals would be coolant resistant. For example this one: https://www.amazon.com/BOKYWOX-Circu...1&rps=1&sr=8-5
Also, I'll be running quite a few circuits, so I would need a valve system, or, several smaller pumps. The latter has my preference. But I am reluctant to buy a series of these plastic (and plastic-y) and expose them to 200F glycol 24/7 only to learn that they break down into a puddle of goo at the most inconvenient moment.
Even though some of them are listed as 100 degrees C compliant:
So... Anyone with hot water/hot coolant pumps (electric ones with hose or thread adapters, a water pump from a car isn't really an option).