Posted by Paul on September 28, 2005, 2:15 am
As a personal rule of thumb, on prices I looked for in the past,
flat plates were going for $00-$000 for a 4' x 8' (29 sq. ft. active)
and evacuated tubes were running over $000 for under 20 square feet of
Flat plates can be under 15% efficient with very hot water in very cold
Evacuated tube collectors can be over 30% efficient under the same
These are just rough estimates, but you may be able to tell from this if
cost effective for your application. Just preheating the water with flat
before you heat it with natural gas can still save lots of money in the long
Posted by Rob Dekker on September 28, 2005, 8:40 pm
Elsewhere in this thread, we found a couple of manufacturers of water-heating
that sell in the range of $50 - $00 /m^2 for the larger panels.
European manufacturers are also in that range.
This US producer here has decent 4'x8' panels for about $00.
Larger panets are cheaper (per sqft).
Of course, you would need to include installation, and water-storage-tank(s),
and a bit for a pump and stuff.
Posted by Paul on September 29, 2005, 3:26 am
Sunray has some nice looking stuff. I was going from the SunEarth pricing.
They start at about $95 and go up beyond $95 I believe. Depends on
double pane, selective coating and such. If he elected to go flat plate for
preheating and was in a cold climate, the double pane might be called for.
Posted by Q on October 31, 2005, 1:33 am
AET in Jacksonville, Florida, has well-designed and built 4'x8' flat-
plate panels for under $US 500. These will work well for just about
anywhere in the continental US. No need to get fancy with vacuum tubes
in most cases.
We are selling and installing commercial systems to hotel laundries that
produce 100 GPD of 140 deg F HW for under $US 25,000. The recently
signed Energy Policy Act of 2005 provides for $US 0.60/sq ft of
additional depreciation for commercial buildings that use solar hot
water. That is a pretty good incentive!
Gulf Coast Solar
Posted by Q on October 31, 2005, 1:46 am
Correction: 1000 GPD
X of 140 deg F HW for under $US 25,000. The recently