Should I add a furnace air filter to my hybrid water heater?


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Old 02-27-24, 06:21 PM
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Should I add a furnace air filter to my hybrid water heater?

I recently got a hybrid heat pump water heater. It has an 8" round air inlet on top, very easy for connecting to ducts (which you can do to bring in air from another part of the house, but I don't need to do that). I've read that the mesh air filters on these water heaters aren't great, and I can believe it from experience with dehumidifiers. Would it be worth it (and most importantly not harmful) to put a furnace filter in front of the air intake to reduce dust getting into the heat pump? Seems like it would be easy to adapt a square-to-round transition box or register box to add a 12"x12" furnace filter on the intake and keep the evaporator coil cleaner.
 
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Old 02-27-24, 09:49 PM
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Good question...... logic says yes.
Basements can be pretty dusty.

I'm not sure 12" square would be big enough.
The larger the size filter the less restriction.
Is there any mention of a max length for the intake line?
Post the model number for me.
 
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Old 02-28-24, 02:14 AM
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I suggest contacting the manufacturer. Better (higher MERV) air filters will restrict air flow more than mesh filters, but any filter will restrict air flow to some extent which will force the unit to work harder. Keep in mind that the filter is used to capture potentially damaging contaminants and higher MERV filters may do more harm than good.
 
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Old 02-28-24, 08:24 AM
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It's a State HPSX-80-DHPT (https://www.statewaterheaters.com/pr...-hpsx-80-dhpt/).

Max duct length by size and type:
8": 100' flex, 300' rigid
7": 50' flex, 155' rigid
6": 24' flex, 65' rigid
5": no flex, 20' rigid

I would certainly use a low-MERV filter, just to catch the dust.
 
 

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