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Old 22-06-2020, 05:42   #16
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Re: Salt water pump continuous flow 110volts for air conditioning recommendations

My best experience over the last 38 years is in using OBERDORFER pumps.
They are heavy duty, reliable and long lasting, unfortunately not cheap.
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Old 23-06-2020, 10:30   #17
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Re: Salt water pump continuous flow 110volts for air conditioning recommendations

Decided to go with the March LC-3CP-MD rated at 500 GPG or up to 24,000 BTU at around $250 vs the larger 48,000 BTU 1000 GPH at over $1000. We have 26,000 BTU split between 3 units and usually only run one at a time, rarely 2, never 3 outside USA (go broke from electric cost)so it should work out.
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Old 23-06-2020, 15:06   #18
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Re: Salt water pump continuous flow 110volts for air conditioning recommendations

The water flow is constant/equal through all the units if there is manifold that is correctly constructed.
It will not matter how many are running, the water flow is what it is...which in your case is 8.3 gals per minute. (500gph divided by 60), which is then split between the 3 units.
So you are close.
Best way to acct for actual flow rate is to run outlet flow from discharge thruhull into a gallon bucket and time it.
That will show you the loss due to plumbing, fittings, hose, head height.
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Old 23-06-2020, 16:49   #19
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Re: Salt water pump continuous flow 110volts for air conditioning recommendations

Well, you've already purchased. But I'll throw in my $0.02.

We live in South Texas - we run our A/Cs a LOT. Also, I have about 45 years of experience in pumps for marine aquarium systems. We've been through our share of March pumps. The biggest problem with them is that if they are not submerged, the cooling channels will pretty easily clog over time, and overheating will kill the pump. The same with the KoolAir. We tried one. It's just like the March, and self destructs when the passages clog.

We now use an Iwaki (I see someone else recommended them) pump. Buy the one with the Japanese motor. Do NOT install it if you might have flameable fumes - I'm not sure it's certified for that. I've used them in really bad marine environments for many year, with great success. Defender sells them.

Another thing we did is we put in a redundant pump. Because they always fail in the middle of the night, right? Just flip a switch and we are back in business. Swap the dead one out when we have the time.
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