2004 Friendship, same issue, but I have a water manifold system. Replacement water heater half-filled with antifreeze while winterizing. This water heater has only 2 pipes, original one had 4 (heat exchanger?). We could see antifreeze freely flowing up & back from pump discharge pipe with all other lines closed off. 'Looks like an extra feed to the water heater by mistake...? Thanks.
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