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Ground Loop Heat Transfer Question - Page 5

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Posted by Robert Scott on September 9, 2006, 12:00 am

Yes, he is cooling the water when it is flowing.  But when the heat pump cycles
off, the water in the heat exchanger approaches ambient house  (or basement)
temperature, which is probably warmer than the source water.  I can tell you
from observing one toilet that is supplied with raw hard ironed well water, the
tank and the bowl become coated with deposits in less than a week.

Robert Scott
Ypsilanti, Michigan

Posted by daestrom on September 9, 2006, 2:28 pm

Ah, perhaps it is related to the exact nature of the hardness.  Up north
(Charlevoix) we never had a problem with iron in the water, but it was still
quite 'hard'.  Toilets never scaled up except in the tank right at the water
line where evaporation occurs.  Same thing here in upstate NY, no water
stains/buildup except in the hot water lines.


Posted by Solar Flare on September 11, 2006, 3:03 am
 Evaporation takes place in a toilet. The ring is where the air meets
the liquid.

Heat exchangers that cool the liquid have no evaporation.

Posted by SJC on September 9, 2006, 1:34 am

  We have hard water here and I just got a 2um cartridge filter from Lowes
for about $5 that filters the water for the hot water heater. Shows right on
the box that it extends the life of hot water heaters. I have to replace a $
filter every 6 months and it works great.

Posted by Robert Scott on September 9, 2006, 4:27 pm


Yes, but you don't run very much water through that hot water heater compared to
what the OP would run through his ground-source heat pump.  That is a lot of
water, and such a filter would need replacing in less that a week, I would

Robert Scott
Ypsilanti, Michigan

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