Re: Issues with Heating in Annapolis, MD
My best guess is that you probably have ice in the discharge hoses for the heating units. Reverse cycle heat pumps cool the discharge water when the system is heating. My guess is that this chilled water has frozen either at or inside of the thru hull. You should be able to see that discharge hose and the thru hull from inside the boat. If I had to deal with this, I would swing by the hardware store and get some "heat tape", which is tape that has a heating element in it that is used to keep pipes from freezing in an unconditioned (attic or crawlspace) space in a home. You should be able to wrap the hose with the heat tape and thaw it out and keep it thawed.
My other concern is that if that hose has frozen that it does not have a tear and that you have not burned out your circulator pump trying to move water against a dead head. When the hose thaws you will need to keep an eye on it to make sure that it is not leaking. You may also want to take the discharge hose off the circulator pump and run it a second to see if it is working.
I walked over and checked; the TruValue Hardware Store on the corner of Forest Drive and Bayridge Avenue carries heater tape in several lengths. (If you pick it up at the TruValue, please feel free to stop into the architectural firm in that complex and say hello.)
Water media heat pumps actually work down to much lower temperatures than air cooled (heated) units so I do not think that this is an issue of the water temperature.
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Curmudgeon at Large- and rhinestone in the rough, sailing my Farr 11.6 on the Chesapeake Bay and part-time purveyor of marine supplies
Last edited by Jeff_H; 01-25-2013 at 08:37 AM.