"Hot water is a lower quality heat source than steam. 100ºF water is a lower quality heat source than 180ºF water. Lower quality heat is easier to obtain and generally costs less.
Designing your emitter system to operate using a…"
"Raising tank temp weekly mostly happens automatically with solar here. No such luck with a refrigerant cycle. In-tank electric resistance elements can easily accomplish that, but the "tankless electric as last-ditch booster"…"
"Heat pumps and solar share a similarity in that maximum efficiency comes from sending cold water to the heat source. Because of this, maximizing their efficiency means not heating the tank directly with the secondary source. Following…"
"The SHPT-50 does look interesting, but I'm having trouble finding out what the actual capacity of the heat pump is (for any of the models, actually.) As someone who designs hybrid systems, I have been recommending tankless electric…"
"An often-overlooked point: Heat pump water heaters remove heat from the space in which they are installed. The warmer that space, the more efficiently they operate. In warm climates, this is a welcome thing almost all year…"
"So much of this depends on the size and orientation of the window. North-facing picture windows are more common than one would suspect, and with our high altitude dark nights, you can really feel the "suck" from the night sky.
"Welcome to Home Energy Pros! Feel free to join the conversation in the Forum and Groups. And share your energy efficiency photos, videos and upcoming events. If you're blogging about home performance, this is the place for you! Don't…"
"I heartily agree that AFUE needs a major re-work. I do believe that measuring overall system efficiency (in something like BTUs per square foot per degree-day) will factor in these second law effects. As long as we include pumping costs, it…"
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Home Energy Pros was founded by the developers of Home Energy Saver Pro (sponsored by the U.S. Department of Energy, under the American Recovery and Reinvestment Act) and brought to you in partnership with Home Energy magazine.