You are here:

Radiant Floor Heating/baseboard to radiant conversion for 200 sq ft room


I am redoing my floors in a room that is about 200 sq ft. The subfloor is going to be taken out so i have been looking into converting the baseboard heating into radiant floor. The water currently goes from the boiler into this room and then finds its way up into the second floor and back down again. I can install pex tubing below or above the subfloor since we are replacing that, and i was thinking about engineered wood as the finish floor. What exactly would i need to do this project, is a manifold necessary? should i run one line through the room and then send it up to the second floor, or should i run the room with the return from the 2nd floor so the water is cooler, or should i have the water go through more than one line that runs water through the space? thanks in advance!

Badger Boiler radiant floor retrofit
Badger Boiler radiant  
Radiant floor retrofits are some the most challenging of all. As with all HVAC projects, but more especially a retrofit radiant floor, a Manual 'J' heat load must be performed for the room in question. Once the load (how much heat the room will require to maintain the thermostat set-point when the coldest day of the year arrives) is determined the appropriate radiant floor panel can be chosen.

There are many radiant floor products on the market and each has its features and benefits but the first question must be answered. How much heat do you need?

The type of radiant floor panel will determine the design water temperature and the floor covering will impact both. A radiant floor panel should generally be on its own zone/thermostat. One PEX pipe from boiler floor and back controlled for temperature.

In many cases a radiant floor will not be enough to heat a renovated room. This is particularly true if there is a lot of window vs wall space. We often will run radiant floors with supplemental heat such a fin-tube, panel radiators or radiant walls for the coldest days.  

Radiant Floor Heating

All Answers

Answers by Expert:

Ask Experts


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

©2017 All rights reserved.