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Old 02-13-2018, 05:10 PM   #1
i3enhamin
 
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Default Espar D5 coolant pump noise

Do I understand correctly, that a hydronic heater, while in standby / pause (e.g. when it's in parking heater mode), must run its circulation pump continuously in order to sense the coolant temperature? Is that very loud? Do you recommend that it's absolutely necessary to put outside the vehicle? I wouldn't necessarily be making an engine coolant connection and would probably use a heat exchanger if I did. Would an interior soundproof enclosure suffice? I understand that it needs to be in the low point of the circuit and that under the vehicle is typical, but... considering putting everything inside and using 90% water and only 10% propylene glycol so as to use less toxic substances and still have good freeze protection.

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Old 02-13-2018, 06:22 PM   #2
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Default Re: Espar D5 coolant pump noise

Quote:
Originally Posted by i3enhamin View Post
Do I understand correctly, that a hydronic heater, while in standby / pause (e.g. when it's in parking heater mode), must run its circulation pump continuously in order to sense the coolant temperature? Is that very loud? Do you recommend that it's absolutely necessary to put outside the vehicle? I wouldn't necessarily be making an engine coolant connection and would probably use a heat exchanger if I did. Would an interior soundproof enclosure suffice? I understand that it needs to be in the low point of the circuit and that under the vehicle is typical, but... considering putting everything inside and using 90% water and only 10% propylene glycol so as to use less toxic substances and still have good freeze protection.

Thanks!


the pump is not that loud. It's more like a constant humm vs the ticking/hammer of the fuel pump. However you will clearly be able to hear it. Especially when sleeping. Why not put inside and insulate? Def worth a shot.

Also you need some anti corrosion inhibiters in your hydronic system. Pure water (di) and glycol will likely shorten life span.
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Old 02-13-2018, 07:04 PM   #3
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Default Re: Espar D5 coolant pump noise

I'm very open to putting it inside and insulating it.

Is there a way to "have it both ways", e.g. to get good corrosion inhibition w/o the toxicity of https://en.wikipedia.org/wiki/Ethylene_glycol?
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Old 02-13-2018, 08:38 PM   #4
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Default Re: Espar D5 coolant pump noise

I used coolant based on polypropylene glycol which is much less toxic. It is just a regular coolant with corrosion inhibitors plus other goodies. https://peakauto.com/products/antifr...motive/sierra/
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Old 02-13-2018, 08:38 PM   #5
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Default Re: Espar D5 coolant pump noise

To answer my own question... seems like something like this or this would work.

edit: posted at exactly the same time... not a contention that above is not a good idea.
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Old 02-13-2018, 08:46 PM   #6
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Default Re: Espar D5 coolant pump noise

I wouldn’t use Camco, it is not automotive brand and it is used to protect RV system from freezing. Peak is a known brand. I use Peak at 50% diluted with distilled water.
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Old 02-15-2018, 12:44 AM   #7
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Default Re: Espar D5 coolant pump noise

The espar pump is fairly quiet if well isolated from the body. Some acoustic insulation would make very quiet.
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