Condensing Boilers in Hydronic Systems


Length: 6 weeks

Instructor: Roy Collver

Subjects: Renewable HVAC: Boilers, Renewable HVAC: Hydronic Heating


Hydronic System Designers: Spend 6 weeks learning how your system designs and control strategies can be tweaked to make the best of the energy savings and comfort benefits condensing boilers have to offer.

Learning Objectives

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Preview the Course Material

Check out a free preview of the course by clicking the button below. This is a live assignment from the course and will give you a good sense for what the course will be like.

Free Preview - Class 1-1
Valuable Calculators & Design Tools Included

Roy has developed simple but very useful calculators to help you make better design decisions. These are worth the price of admission on their own.

Hands On Learning For Designers

We'll get deep into the numbers and details of how to design state-of-the-art condensing boiler systems. You'll actually be doing it yourself.

Access To Archived Discussion Boards

Upon request, we will grant students access to archived discussion board conversations between Roy Collver and past students. These archives span several sessions of the course and contained a wealth of information for beginners and veterans alike.

Self Paced Online Course

You can begin this online course instantly upon enrollment. Get access to all of the course materials as soon as you enroll. The instructor-led session will begin on the scheduled start date. During the session dates the instructor will be in the course answering questions on the discussion board and reviewing project work.

Access Information And Build Your Training Library

After enrolling, the course materials will remain in your account and be accessible 12 months (1 year) after enrollment. Access can be extended beyond 1 year with a monthly membership. Return to your course anytime with online access from anywhere in the world.

Earn A Certificate Of Completion

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 one-click LinkedIn integration.

Earn Continuing Education Credits

Self Report with Certificate: 18 AIA LU/HSW Credits

When I have a detailed question about the inner operation of a modulating / condensing boiler, Roy Collver is the first person I contact. The investment in Roy’s HeatSpring course is a fraction of the cost of a single mod/con boiler, but it will teach you concepts, procedures, and details that will return that investment many times over.

- John Siegenthaler, P.E., author of "Modern Hydronic Heating"


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Roy Collver

President, OTBC Inc

Hydronics Specialist / Educator, Class 1 Gas-Fitter and Illustrator, Roy has applied his creative force and problem solving abilities toward the improvement of hydronics in North America for over 35 years. His varied experience at the very cutting edge of new development in hydronics has allowed him to apply his unique knowledge and skill set toward becoming a premier...[more]

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Course Outline

Welcome - Orientation Materials

This course is self-paced, so you don’t need to be logged in at any specific time. You can complete the material whenever is convenient and work ahead or catch up if you fall behind. The course discussion board is a great place to interact with other students and ask questions. Expect to dedicate a minimum of 5 hours per week to the course. This session runs for the posted dates and you will receive weekly emails to keep you on pace. Course materials will remain in your account with minimum guaranteed access for 12 months (1 year) after the course ends. Please review the orientation materials and introduce yourself on the discussion board.

  • Introduction to HeatSpring (1 minute) (Video) preview
  • Set up email notifications and your student profile (Text)
  • Introduce yourself on the discussion board (Text)
Week 1 - Introduction

Learn the key differences between condensing boilers and conventional “high temperature” boilers. Review how a hydronic system turns a fuel gas into useable heat. Gain a clear understanding of how a conventional boiler fits into a hydronic system, in order to understand the similarities and the crucial differences when using condensing boilers.

  • Class 1-1 (Video) preview
  • Class 1-2 (Video)
  • Class 1-3 (Video) preview
  • Website resource: AHRI Residential boiler ratings (Resource)
  • Website resource: AHRI Commercial boiler ratings (Resource)
  • PDF file: 1st Exercise (Download .pdf)
  • PDF file: Resource links (Download .pdf)
  • PDF file: Resource links 2 (Download .pdf)
  • PDF file: Basic control essay (Download .pdf)
  • PDF file: Basic control essay 2 (Download .pdf)
Week 2 - The basics of gas combustion - how does condensation come into play?

Learn how to evaluate performance ratings to understand how much you can reasonably expect to save. Review efficiency testing standards to accurately compare one boiler to another. We'll discuss how to design mod-con boilers for maximum efficiency gain, longevity, and reliability and how condensation affects the construction and installation of these boilers. We'll also review proper combustion analysis for optimal efficiency and commissioning of equipment, while assuring safety and reliability.

  • Class 2-1 (Video)
  • Class 2-2 (Video)
  • Class 2-3 (Video)
  • Class 2-4 (Video)
  • Class 2-5 (Video)
  • Class 2-6 (Video)
  • Class 2-7 (Video)
  • PDF File: Vitodens I&O Manual (Download .pdf)
  • PDF File: IBC I&O Manual (Download .pdf)
  • PDF File: NTI I&O Manual (Download .pdf)
  • PDF File: HTP I&O Manual (Download .pdf)
  • XLS Spreadsheet: Savings calculator (Download .xls)
  • PDF file: Estimate chart (Download .pdf)
  • PDF File: 2nd week exercise (Download .pdf)
  • Click here to upload your completed Week 2 Exercise (Submit File)
Week 3 - Combustion evolution and the technology - All about the machines, how they evolved, and how they are built now

Review equipment operation, construction, features and limitations and assess the suitability of each condensing boiler model for general service and for specific applications. Learn how to evaluate and interpret the engineer's spec sheets and manufacturer's operation and installation manuals to quickly locate and review the information pertinent to your system’s applications.

  • Assignment 1-1 (Video)
  • PDF File Baseboard ratings (Download .pdf)
  • PDF file: Corrosion articles (Download .pdf)
  • Heat Exchanger Design - Class 3-1 (Video)
  • Assignment 1-2, Boiler sizing (Video)
  • Water Quality - Class 3-2 (Video)
  • PDF File: Glycol article - 2000 (Download .pdf)
  • PDF File: Water Quality article 1-2004 (Download .pdf)
  • PDF File: Water Quality article 2-2004 (Download .pdf)
  • PDF File: Clean & flush article 2008 (Download .pdf)
  • I&O Quick review (Video)
  • PDF File: Hydraulic separator information (Download .pdf)
Week 4 - Where condensing occurs, and how to get more – Applications and system design for maximum efficiency

Learn the “envelope” where systems and boilers work best – the “sweet spots” for economical solutions to energy efficient systems. Detail how to perform an iterative review of a system design - considering the important capabilities and limitations of different boilers.

  • Class 4-1 (Video)
  • Class 4-2 (Video)
  • Class 4-3 (Video)
  • PDF File: Class 4, Exercise 1 (Download .pdf)
  • Exercise 4-1 (Video)
  • PDF File: Exercise 2 Instructor estimates (Download .pdf)
  • Submit your completed exercise (Submit File)
  • PDF File Plastic venting (Download .pdf)
  • PDF file: Multi Venting Cat IV article 2009 (Download .pdf)
  • PDF File: Multi Venting Cat IV article, current (Download .pdf)
  • PDF File: Future venting article (Download .pdf)
  • Class 4-4 (Video)
  • Class 4-5 (Video)
  • Class 4-6 (Video)
  • PDF File Venting Categories Chart (Download .pdf)
Week 5 - Control strategies and how to maximize efficiency. Enhance the capabilities and operation of your hydronic systems by learning the control strategies that work best for you

Review “fringe” applications that are starting to lean towards mainstream - base load condensing boilers, geothermal and solar integration, snowmelt and volume water heating, etc. Discuss how condensing boilers are suited, or not suited for these unique applications. Access resources to learn more about how modern controls are making it possible to integrate boiler operation and system operation in ways not even imagined a decade ago.

  • Class 5-1 (Video)
  • Class 5-2 (Video)
  • Class 5-3 (Video)
  • Class 5-4a (Video)
  • Class 5-4b (Video)
  • Class 5-4c (Video)
  • Class 5-Combo 1 (Video)
  • Class 5-Combo 2 (Video)
Week 6 - Capstone Project - Present your own system design & select a boiler and control strategy for each design that will optimize the efficiency, comfort and longevity of the each system.

Capstone projects are due within one week of the end of the session. Students will continue to have access to all of the training materials for a full year after the session ends, but the instructor will not be available to give detailed feedback for project designs that are submitted after the official session end date.

  • PDF File: Capstone Project - Part 1 (Download .pdf)
  • Upload your completed file (Submit File)
  • PDF File: Choosing boilers - steps (Download .pdf)
  • Boiler selection checklist (Video)
  • Capstone Part 2 (Video)
  • PDF File Capstone 2 (Download .pdf)
  • Upload your answers Capstone 2 (Submit File)
After The Course - Feedback and Additional Resources

No matter how great this course is, we know it's just one part of a bigger journey. In this module we'll start thinking about what comes next. You'll provide feedback on the course, request a certificate of completion, and learn about additional resources. Don't forget that you'll have access to the course materials will remain in your account with minimum guaranteed access for 12 months (1 year). Feel free to come back as much as you like to continue learning, and please stay in touch. Let us know what you do next and how we can help.

  • 1 Year of Access to Course Materials (Text)
  • Feedback: 2-minute Exit Survey (Survey)
  • Consider Joining as a Founding Member (Resource)
  • Certificate of Completion: Request a Certificate (Certificate)
Free Preview - Class 1-1

Free Courses on Renewable HVAC, Boilers, Hydronic Heating

How to Design and Sell Mod-Con Boilers

Enroll in this free course and learn the basic economics of mod-con boilers in retrofit and new construction applications. It will teach you what you need to know to start selling this equipment more effectively.

Multiple Mod-con Boiler Concepts

In this free lecure, Roy Collver examines important details you should know when combining two or more boilers into a single heating plant. He covers applications from large residential, up to bigger commercial and institutional systems.

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