How to Use a Meter
Don’t fear the meter — it’s an essential tool. A multimeter is an essential tool for working with controls. It’s as expected for a professional heating guy to have a mete...
Systems Help Center
Our comprehensive HVAC Systems Help Center covers a wide range of HVAC-related topics, including air conditioning and heat pumps, geothermal, hot-water heating, thermostats and controls, solar, steam heating, and warm air. We also have a section of informative and entertaining articles to help you sharpen your HVAC business skills. And our Heating Museum is a captivating journey through the evolution of HVAC technologies.
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Recent Articles
How Many Zone Valves Can Be Put on a Transformer?
Every component in a controls circuit is a power supply, a switch or a load — no other possibilities. And that means that every control, hydronic or otherwise, is one of ...
Electrical Grounding
Whether for safety or operation, knowing when to ground is essential. "Wha'd ya mean?" says Bubba the plumber-recently-turned-heating-tech. "How come you're tellin' me I ...
Everything You Need to Know About Relays
A relay is just a switch. The purpose of any switch is to turn something on and off. A relay turns HVAC equipment on or off.
Aquastat Relays - What's A Differential Anyway?
An aquastat relay is a combination of three controls. As its name suggests, it's an aquastat, a relay and a transformer. All three components are mounted together in what...
What Could Go Wrong?
We learned from the pandemic that education is available in many more places than just at live seminars. Webinars, for instance, are safer because you’re watching them al...
What Does An Aquastat Do?
It's no mystery that an aquastat is a control that goes with a boiler. If you don't know much more about it than that, though, you have a lot of company. There seems to b...
How to Size and Pipe Buffer Tanks
HeatingHelp.com is delighted to partner with Caleffi on the Hot Topics with Hot Rod webinar series. In this episode, Bob "Hot Rod" Rohr shares his knowledge about buffer ...
It's Not Me; It's You
I was sitting next to a 99-year-old woman in an auditorium. I knew she was 99 because she introduced herself as Irene and told me her exact age. Then she sat back and wai...
What's In A Name?
We have so many names for common things and tools that we use in this business; and because I have way too much time on my hands, I started wondering how those names came...