Return to the Renewable Energy Forum | Post a Follow-Up

geo or solar for water heating?

Posted by razl (My Page) on
Mon, Nov 5, 07 at 16:14

I will be installing a geothermal unit in the northeast (RI). Would I be more economical to install a desuperheater add-on to the geothermal or go solar heating? I assume installing both would not make sense.

Follow-Up Postings:

RE: geo or solar for water heating?

Good question.

We have a three ton geo heatpump (a Tranquility 27) with the desuperheater, but its inclusion was a mistake the installer made. We took it as was with the thought that it would be worthwhile enough after all, but I have not yet hooked it up. We only use the unit about half of the year (we need very little cooling) so I put it off over the summer ... well, you know the drill.

But I am attracted by the vacuum solar tubes, which are claimed to be useful here in western Montana even in overcast and cold conditions. We'd spend close to $3K on such a system, with an anticipated payoff (at current natural gas prices) of about 7 years.

But the desuperheater would cost me almost nothing more to finish installing, even though it added about $300 to my heatpump cost. I could probably recoup that in about three years. Right now it's just a sunk cost.

But "What if", since I already own the desuperheater, I installed it in tandem with the solar tubes? It would be at its most efficient at exactly the time the solar tubes were at their least efficient- when it was very cold. (Or I may be wrong- it may be that the tubes are plenty efficient when it's veryvery cold, as long as it's clear; it may be fog and overcast conditions that I need to worry about concerning the solar tubes.)

Well, I haven't answered your question, but there's my two-bits worth for now, and thanks for bringing the question up. Good luck to you and I hope we both learn something from this!


RE: geo or solar for water heating?

Its a no-brainer. If youre already installing geothermal, install the desuperheater too. If youre not satisfied with the result, then look to something else.



 o Post a Follow-Up

Please Note: Only registered members are able to post messages to this forum.

    If you are a member, please log in.

    If you aren't yet a member, join now!

Return to the Renewable Energy Forum

Information about Posting

  • You must be logged in to post a message. Once you are logged in, a posting window will appear at the bottom of the messages. If you are not a member, please register for an account.
  • Please review our Rules of Play before posting.
  • Posting is a two-step process. Once you have composed your message, you will be taken to the preview page. You will then have a chance to review your post, make changes and upload photos.
  • After posting your message, you may need to refresh the forum page in order to see it.
  • Before posting copyrighted material, please read about Copyright and Fair Use.
  • We have a strict no-advertising policy!
  • If you would like to practice posting or uploading photos, please visit our Test forum.
  • If you need assistance, please Contact Us and we will be happy to help.

Learn more about in-text links on this page here