Welzig always offers FREE estimates on your equipment replacement

For emergency service on a new water heater, you can count on Welzig for quick service, great client care, and experienced technicians. We offer same day appointments for emergencies because we know how important hot water is. We value your time and money, so we offer one hour windows for future appointments as well.

We Service All Makes And Models

No matter what type of water heater you have in your home, Welzig Heating and Air can repair and maintain it. If you have questions about your tank water heater, we have a knowledgeable staff ready to help. Just give us a call at (720) 336-3777 or use the form on our contact page.

Discover how we can help you today:

  • Same day hot water
  • Professional grade water heaters- A.O. Smith and Bradford White
  • Fast repairs on ALL water heater brands
  • Energy savings on new installations
  • Removal of your old unit
  • Great 2 year full coverage warranty on new installs
  • Upfront pricing
  • Experienced technicians
  • Free second opinions on repairs and replacements
  • One hour time windows for diagnosis (except same day emergencies)

Water Heater Repair in Boulder, CO | Water Heater Installation Longmont, CO | Water Heater Service Louisville, CO

Water Heater Service, Water Heater Maintenance, Tank Water Heaters, Water Heater Repair & Water Heater Replacement Boulder, CO, Longmont, CO, Louisville, CO & Lafayette, CO

Water Heater Service in Boulder, CO | Water Heater Maintenance Longmont, CO | Water Heater Replacement Louisville, CO

Water Heater ServiceWater Heater InstallationWater Heater RepairWater Heater MaintenanceWater Heater Replacement ∴ Longmont, CO ∴ Lafayette, CO ∴ Boulder, CO

Satisfied Customers
They Speak For Us

Bob came out to look at our swamp cooler and was remarkably helpful and professional. Not only did he give me a knowledgeable diagnosis, but he also taught me a lot in the process. We’ll be calling him for all future needs with our cooling system.


Our 23-year-old A/C system ran out of “borrowed time” and became too difficult to continue maintaining. With great advice from Casey Welzig,, we replaced the old system with a Bryant Evolution A/C system. Max Loustaunau and Seth Bernhardt did an excellent job with removing the old system and installing the new one. Both of them are great to work with — very professional and very personable. We are really amazed at how much better the new system works!


Dave Kaplan-Gomez and James Miltersen installed my new Tankless Water Heater. Both were polite and professional. Care was taken not to damage anything in my house which I really appreciated. I use Welzig for all my HVAC needs and highly recommend them.

Leave Us a Review!
Google Reviews
Angies List Reviews
Yelp Reviews
Facebook Reviews
Contact Us Now For A
Free Estimate

Lafayette, CO

Longmont, CO

Boulder, CO

Louisville, CO