[RE-wrenches] hydro coils

[Best Power Mario]

Todd,
Holt and Travis have really hit the nail on the head re: problems with these types of configurations.  However there is a successful way of doing it.  I initially learned many years ago what NOT to do, and how to provide protection against Flashing of the liquid.  I'd agree, the heat exchanger shoud be exterior.  The ones i built were made with the extruded aluminum used to make thermal solar panels that allow the friction fit cup to receive a 1/2" copper pipe.  A combination of series or parallel sections would be fixed to the outside of the firebox.  This loop has to be pumped! the pump control should be activated through a low-voltage relay through a paralleled set of snap-disks (for redundant safety) located at the heat exchanger.  There are a veriety of fixed/adjustable snap-disks with setpoint ranging in the low to high temperature ranges.  I liked using the fixed 110F on/90F off, they are cheap.  
Hope this helps
Mario
Best Power Intl.
  ----- Original Message ----- 
  From: Travis Creswell 
  To: 'RE-wrenches' 
  Sent: Thursday, November 06, 2008 9:01 AM
  Subject: Re: [RE-wrenches] hydro coils


  Assuming you’re talking about the units that actually installed in the fire box; I’ve actually disconnected a few over the years because they overheated the water to point of regularly blowing the pop off valve of the domestic hot water heater.  It’s pretty spooky to rely on the P&T valve in that manner.  These were retired folks that didn’t use much hot water and plenty of time to keep the wood stove stoked.  Hyrdo Coils (etc) would probably work OK for an installation that didn’t keep the wood stove going 24hrs/day, used plenty of hot water and had a very attentive owner.

   

  But to answer Todd’s question.  I haven’t seen a new one for long time.  Seems like I’ve seen a few NOS ones on Ebay and in the dusty corners of wood stove dealers.  There was a product that actually installed on the outside of the firebox in such a manner that the heat was conducted to it.  I don’t remember who made it and it’s been years since I’ve seen it.  Of course it wouldn’t be near as efficient but that would be a good thing in this case plus it didn’t void the stoves warranty because you didn’t have to drill any holes into the stove.

   

  Best,

  Travis Creswell

  Ozark Energy Services

   

   


------------------------------------------------------------------------------

  From: re-wrenches-bounces at lists.re-wrenches.org [mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of holtek at sbcglobal.net
  Sent: Thursday, November 06, 2008 8:40 AM
  To: RE-wrenches
  Subject: Re: [RE-wrenches] hydro coils

   

  Todd,

  Just a friendly point - I know you probably know---be real careful doing that. That use to be an option on some of the woodstoves I sold 25 years ago until,.....BOOM! ..........DIY not recommended. 

   

  Holt E. Kelly
  Holtek Fireplace & Solar Products
  500 Jewell Dr.
  Waco,Tx. 76712
  254-751-9111
  254-228-9621 (cell)
  holtek at sbcglobal.net

  www.holteksolar.com


   

    ----- Original Message ----- 

    From: Todd Cory 

    To: re-wrenches at lists.re-wrenches.org 

    Sent: Wednesday, November 05, 2008 11:57 PM

    Subject: [RE-wrenches] hydro coils

     

    I have a client that is wanting to add a water loop in their wood stove. 
    Does anyone know if the old SS hydro coils are still made?

    Todd

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