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Radiant Floor Heating/Boiler for radiant floor in shop


What heat source do you recommend for the radiant floor in my shop?
The shop is an out building 28ft x 32ft with a 10ft ceiling.  The fuel will be propane.
The walls are insulated to R-19.  The ceiling to R-50.
The floor has vapor bearer then 2” ridged foam, (R-10), with 4 loops of ½” Pex tubing each 240ft long, (one zone). The tubing was stapled at 10” on center, then rebar added and topped with 5” concrete.  The perimeter of the floor has 2” ridged foam, (R-10), buried vertically 24” deep
Openings in the shop are:  One service door.  One 10ft x 10ft. insulated roll up garage door, (R-6.5).  The shop has no windows.
The requirement for domestic hot water will be minimal; a small stand-alone, (110v 6 gallon), unit should suffice.
The shop is located in the middle of Wisconsin.  To prevent freeze damage I plan to use a glycol mixture.
Looking for your help in “boiler” selection.
Thanks koolson

We design many radiant floor heating systems for shops all over N.America.

It sounds like you did everything right so far. There are a few options for heating small spaces such as yours, but is all starts with a proper heat load. Two things you want for sure is sealed combustion and outdoor reset. You will also want to consider the ventilation requirements and the added load presented by same.

If you would like us to perform a heat load and specify equipment please send a simple floor plan to  

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Morgan M. Audetat


Radiant panel heating design, including floors and ceilings, European wall panels and snow melting for residential and light commercial buildings..............................................................-Master of Steam and Hot Water,City of Minneapolis....................................................--- Master Plumber, State of Minnesota...........


30 years..... Charter Board Member - Radiant Panel Association, former manufacturer of condensing boilers, former national distributor of radiant floor products, son and apprentice of mechanical & plumbing contractor. Current mechanical/plumbing contractor specializing in hydronic based, integrated HVAC systems. Radiant floor heating/cooling. Snow Melting. Condensing Boilers. Indirect water heaters. System design, consulting and technical training world-wide. Licensed contractor, designer, installer and consultant.

B.S. University WI 1981 CONTINUING EDUCATION: Viessmann Condensing boiler and Solar water heating certification 2010, N.D.S.U. Lead Worker RRP certification 2010, Knight condensing boiler certification 2009, Wrightsoft Manual ’J’ CAD certification 2009, RPA Designer & Installer Certification 2008, Nate Hydronic/Forced Air Certification 2008, Uponor/Wirsbo advanced design school certification 2007, Buderus Wall-hung certification 2007, Power Limited License (low voltage controls) 40 CE credits 2005, Basic Hydronic Certification IPEX & Northern Alberta Institute of Technology 1998, Charter Board Member - Radiant Panel Association 1994, Residential Off-Electric to Hydronic Conversion Heating School – Canadian Hydronics Council 1994, B&G Little Red School House 1993, Rood Utilities (now Auburn Technical Institute) Oil Burner School 1993 ,Tekmar Controls residential and commercial 1993, Division Manager and Advanced Hydronic Seminar Instructor for the first Exclusively Hydronic Radiant Floor Distributor in the USA 1990, Hydronic Radiant Heating Association Workshop participant with Richard c. Bourne, PE spring 1988, Master Plumbing, Hydronic, Solar Course Red Rocks Community College 1987.

Awards and Honors
2009 System Showcase Award - Radiant Panel Association

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