About this course

Professionals with relevant experience: learn the latest, most advanced concepts for integrating solar with radiant heating systems.

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Learning Objectives

  • Applications of solar & radiant
  • System types and stagnation
  • Techniques for integrating solar with radiant
  • Code and standard considerations
  • Combisystem economics

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Course outline

6 modules • 76 assignments • 12:51 hours of video lectures

Welcome • 1 assignments
Orientation Materials

This is a self-study on demand course. This course is self-paced, so you don’t need to be logged in at any specific time. You can get started immediately after you enroll and the course materials will remain in your account with minimum guaranteed access for 12 months (1 year) after enrollment.

  • Meet Vaughan Woodruff, your course instructor, and learn more about the course (11:41 minutes) Preview
Module 1 • 11 assignments
Applications of Solar & Radiant

The course begins with a discussion of solar (heating & PV) and radiant technologies, how they are complementary, advantages, and challenges of integrating them.

  • Introduction to Week 1 (01:21 minutes)
  • Solar Technology Tour (42:20 minutes) Preview
  • Applications of Solar & Radiant - An interview with Mark Eatherton of the Radiant Professionals Alliance (26:46 minutes)
  • > Required reading: Solar Heating and Cooling Applications (.pdf)
  • Integration Gone Bad, Part 1 (30:57 minutes)
  • Integration Gone Bad, Part 2 (23:39 minutes)
  • Integration Gone Bad, Part 3 (36:45 minutes) Preview
  • > Required reading: The Glitch & The Fix, "Seat of the Pants Solar" (.pdf)
  • > Exercise: Documenting System Errors (.pdf)
  • >> Beyond the course (optional): Well-Grounded Solar, A versatile way to integrate solar thermal and geothermal heat pumps (.pdf)
  • >> Beyond the course (optional): Solar District Heating
Module 2 • 12 assignments
System Types and Stagnation

This week we'll discuss the types of solar heating systems commonly used for solar combisystems and explore the overheating considerations that are unique to solar combisystems.

  • Introduction to Week 2 (03:16 minutes)
  • Antifreeze System Components & Operation (33:16 minutes)
  • Drainback System Components & Operation (21:23 minutes)
  • > Required reading: Caleffi idronics 6 - Solar Thermal Combisystems (p. 3-14; p. 23-26) (.pdf)
  • Stagnation Behavior (46:09 minutes)
  • Tutorial for Antifreeze Design Considerations Tool (34:07 minutes) Preview
  • > Spreadsheet: Antifreeze System Design Considerations (.xlsx)
  • > Required reading: Stagnation behavior in solar thermal systems (.pdf)
  • > Exercise: Evaluating System Conditions (.pdf)
  • >> Beyond the course (optional): COLLECTORS, SYSTEMS, AND APPLICATIONS (p. 18-44), from NABCEP Solar Heating Installer Resource Guide (.pdf)
  • >> Beyond the course (optional): Protecting Water Heating Systems with Expansion Tanks (.pdf)
  • >> Beyond the Course (optional): Heliodyne's PSP Method (by Heliodyne) (.pptx)
Module 3 • 23 assignments
Techniques for Integrating Solar with Radiant

Beginning this week, we'll get into the details of solar storage strategies, and control considerations in solar combisystems. You'll learn some techniques to assist with system design for your project. This week spills into Week 4, where we will explore codes and standards related to these systems.

  • Introduction to Week 3 (03:25 minutes)
  • Integrating Solar and Radiant, a Conversation with John Siegenthaler, P.E., Appropriate Designs (39:31 minutes) Preview
  • Thermal Stratification (24:43 minutes)
  • > Required reading: CYLINDERS (p. 56-67), from Viessmann Technical Guide, Solar Thermal Systems (.pdf)
  • Tank-In-Tank (35:15 minutes)
  • >> Supplemental Resource (optional): Triangle Tube Smart Multi Energy Tank Installation Manual (.pdf)
  • Tank-in-Tank with Heating Lance (21:50 minutes)
  • >> Supplemental Resource (optional): Buderus Solar Design Guide (.pdf)
  • Immersed Coil with Sidearm Heat Exchanger (28:25 minutes)
  • >> Supplemental Resource (optional): Lochinvar Strato-Therm+ Installation & Operation Manual (.pdf)
  • Immersed Coil with Priority Loading (16:44 minutes)
  • >> Supplemental Resource (optional): SunMaxx StorMaxx CTEC Brochure (.pdf)
  • One-Tank Solution, Auxiliary Heat Integrated into Solar Storage (20:48 minutes)
  • >> Supplemental Resource (optional): HTP Versa Hydro Solar Supplement (.pdf)
  • Priority Loading with Separate Tanks (20:25 minutes)
  • Integrated Controls (14:40 minutes)
  • >> Supplemental Resource (optional): SolarLogic Integrated Control Users Manual (.pdf)
  • > Required reading: DRAINBACK SOLAR COMBISYSTEMS from Caleffi idronics, Vol. 6: Solar Thermal Combisystems (.pdf)
  • > Exercise: Configuring a Solar Controller for Priority Loading (.pdf)
  • > Recommended reading (optional): Storage Strategies (.pdf)
  • >> Beyond the course (optional): Caleffi idronics, Vol. 6: Solar Thermal Combisystems (.pdf)
  • >> Beyond the course (optional): Viessmann Technical Guide, Solar Thermal Systems (.pdf)
  • >> Beyond the course (optional): Modern Hydronic Heating by John Siegenthaler
Module 4 • 10 assignments
Code and Standards Considerations

This week we'll discuss codes and standards related to solar heating, including the USEHC, ASME requirements, ComibSol Best Practices, and other key design and installation requirements.

  • Introduction to Week 4 (02:27 minutes)
  • Codes and Standards, A Conversation with Les Nelson of IAPMO (29:57 minutes)
  • Solar Combisystem Codes and Standards (33:24 minutes)
  • Legionella (18:59 minutes)
  • > Required reading: CombiSol Project, Criteria for Best Practice (.pdf)
  • > Required reading: Code Considerations in Solar Water Heating Systems (.pdf)
  • > Required reading: Standardizing Solar Combisystems (.pdf)
  • Solar Combisystem Codes and Standards
  • > Recommended reading (optional): CombiSol Project, State of the Art Report on Solar Combisystems (.pdf)
  • > Recommended reading (optional): Legionella in Combisystem Tanks (.pdf)
Module 5 • 13 assignments
Combisystem Economics

In the sales process, prospective clients will often inquire about the benefits of a solar heating system. Analyzing system production when integrating solar with a radiant system requires understanding of building science and solar modeling programs. This week, we will analyze the information needed to model these systems and examine how to use the results of these models to support the sales process.

  • Introduction to Week 5 (04:15 minutes)
  • Selling Solar Combisystems, a conversation with Claudia Pavel of SolarLogic, LLC (36:34 minutes)
  • Modeling Solar Combisystems (40:08 minutes)
  • >> Resource: Sample Combisystem Modeling Output (.pdf)
  • > Required reading: How to Perform a Heat-Loss Calculation, Part 1
  • > Required reading: How to Perform a Heat-Loss Calculation, Part 2
  • >> Resource: 2012 International Plumbing Code, Appendix D - Degree Days and Design Temperatures
  • >> Resource: Manual J Residential Load Calculation - Outdoor Design Conditions
  • System Payback (33:44 minutes)
  • >> Resource: Database of State Incentives for Renewables & Efficiency
  • >> Resource: EIA's Heating Fuel Comparison Calculator (.xls)
  • > Exercise: Determining System Payback (.pdf)
  • > Recommended reading (optional): Annual Efficiency Calculation for Condensing Boilers (.pdf)
Module 6 • 2 assignments
Capstone Project

To finish out the course, you're going to design a full system, including drawings, calculations, and equipment selection. You'll walkaway with the confidence to do these designs on your client projects.

  • System Sizing (34:47 minutes)
  • > Capstone Project: Solar Combisystem Design (.pdf)
Conclusion • 4 assignments
Feedback and Additional Resources

This is our last module but you still have access to the all of course materials for 12 months (1 year), so keep working and you'll be able to complete the course at your own pace. After your year of access expires you can optionally extend access with a HeatSpring Membership. Enjoy the course and keep in touch!

  • 1 Year of Access to Course Materials
  • Feedback: 2-minute Exit Survey
  • Consider Joining as a HeatSpring Member
  • Certificate of Completion: Request a Certificate

Continuing Education Units

Approved for the following CEUs

  • 1 IAPMO CEUs


Frequently asked questions

How does this course work?
You can begin this online course instantly upon enrollment. This 6 module course is delivered entirely online. This is a self-study, self-paced course and you can set your own schedule to complete the materials. You can begin the lecture videos and other course materials as soon as you enroll. After successfully completing the course, you will be able to generate a certificate of completion.
How long do I have access to the materials?
Students get unlimited access to the course materials as soon as they enroll and for one year (365 days) after enrollment. Rewatch videos and review assignments as many times as you want. View updates the instructor makes to the course as the industry advances. Return to your course anytime with online access from anywhere in the world. After the one year of access expires, access can be extended by joining as a HeatSpring member. A single membership extends access to course materials for all past enrollments.
Is there a certificate of completion?
Yes, when you complete this course you are eligible for a certificate of completion from HeatSpring. You can download your certificate as soon as you have completed all of the course requirements. Students can easily share their verified certificates on their LinkedIn profiles using our LinkedIn integration.
Can I register multiple people?
Yes please visit our HeatSpring for Teams page to get a group discount.


Based on 3 reviews
students have taken this course

Excellent course regarless your expertise in the fiel you'll always learn a lot!

Kevin L
Frank B

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