Click here to Find a Contractor in your area.
Welcome! Here are the website rules, as well as some tips for using this forum.

If you've found help here, check back in to let us know how everything worked out.
It's a great way to thank those who helped you.
Need to contact us? Visit https://heatinghelp.com/contact-us/.

Snow melt boiler

Are there any ModCon boilers approved for use with Glycol? I have a customer who doesn't want make up water for boiler, just glycol feed tank. This is for snow melt of 1500 sq. ft. driveway in Northern Illinois.

Comments

  • ZmanZman Posts: 4,995Member
    I believe they are all approved for glycol. The question is, which models can run at 50%. Triangle tube and Lochinvar have approved 50% in the firetube models in the past. I have not checked the most recent I&O's
    "If you can't explain it simply, you don't understand it well enough"
    Albert Einstein
  • GroundUpGroundUp Posts: 559Member
    edited August 22
    I haven't seen one that doesn't allow glycol, but for only 1500 sq ft in likely a single zone there should be no need for a glycol feeder. Maybe 40 gallon total system volume? Even in the frozen tundra of MN, I've never needed more than 40% in a snowmelt system. My system at home gets tinkered with and abused very hard on a regular basis, simply to test the limits. We had a -42F morning last winter and my bare sidewalk with 40% propylene was pumpable and making heat in about a minute
  • Bob SersenBob Sersen Posts: 4Member
    The glycol feeder takes the place of make up water to boiler, which is required for any system to protect the boiler in case of a leak. I'll check some I&O manuals, but many of them want a heat exchanger between the boiler loop and glycol system
  • GroundUpGroundUp Posts: 559Member
    I know what the feeder is for, my point is that radiant systems don't just develop a leak. Boilers (any I've seen, anyway) have a LWCO to protect themselves in the event of low water and snowmelt is not a life safety system. If there is a leak it needs to be addressed, not band-aided by a glycol feeder. Do you have a particular boiler in mind? I run primarily HTP, Laars, and Lochinvar but I have never heard of any brand requiring a HX for glycol
Sign In or Register to comment.

Welcome

It looks like you're new here. If you want to get involved, click one of these buttons!