Go to Heating Help homepage
Go to Heating Help homepage

The #1 Online Resource for HVAC Answers

Find the answers to ALL your questions about HVAC systems, both old and new!

Heating Resources

Browse our resource library on heating systems.

Find Answers

Join the Conversation

Jump in a conversation or post your questions on The Wall.

Ask a Question

Find a Contractor

Looking for a heating professional near you?

Get Started

Systems Help Center

View all
A/C and Heat Pumps
Geothermal
Heating Museum
Hot-Water Heating
HVAC Thermostats and Controls
Solar
Steam Heating
The HVAC Business
Warm Air

The Wall (The Forum)

Join the Forum
Graveyard of Heat-Timer Varivalves
by patrykrebisz at 3:38 pm on 2/11/2026
Can my vintage boiler wiring be updated to modern wiring?
by TheUpNorthState88 at 9:54 pm on 2/11/2026
That Pesky O₂ Molecule – How Oxygen Finds Its Way Back Into a Steam Boiler
by RayWohlfarth at 11:12 am on 1/16/2026
Is this my main line radiator air valve?
by erics_guerron123 at 5:38 pm on 2/12/2026
Sanity check on older hydronic boiler setup
by walnut at 10:26 pm on 1/26/2026
need help on boiler cleaning
by azward at 11:08 pm on 2/9/2026

What's New in the HeatingHelp.com Store

View all

Industry News

View all