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Old 02-28-2019, 08:22 PM   #2
Dick Steinkamp
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Join Date: Apr 2016
Location: Bellingham, WA
Posts: 1,163
Default Re: Overheating cured by adding thermostat

Exactly the same problem and solution with my 1930. I believe the new pumps have TOO MUCH flow. Another solution might be to shave some off the WP impeller blades.
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