I've used the Mermaid and it works quite well. However, I'd point out that the stock raw water heat exchanger pump, the Teel, is a lousy piece of kit. You're much better off going with one of the upgraded pumps, but not buying it from Mermaid, since they charge a premium for it.
The Teel pump:
You're much better off with a higher spec, more durable March pump, like this one:
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
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Still—DON'T READ THAT POST AGAIN.