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Welzig always offers FREE estimates on your equipment replacement

When you trust your water heating needs to Welzig Heating and Air, we make sure you benefit from quality products, expert installation, and courteous service.  Our licensed specialists perfectly match your household needs, lifestyle, and expectations to an efficient and reliable water heater for a sufficient supply of clean, hot water, no matter the size of your home.  Whether you’re satisfied with traditional tank-style heaters, or are ready to upgrade to a tankless model, we help you determine the ideal solution.

Tankless Water Heater Installation, Repairs & Service

Along with skilled installation and replacement, Welzig Heating and Air provides essential maintenance and repair across Boulder, CO and surrounding areas.  Having your water heater annually inspected safeguards against sudden malfunctions, property damage, safety hazards, inconvenience, sediment buildup, and also extends the life of your equipment.  For any concerns or problems you encounter, call on the licensed team from Welzig Heating and Air.  Water heating installation, upkeep, and repair should not be considered a do-it-yourself project.  Our team is trained to exacting standards, equipped with specialized tools, and draws from extensive in-field experience.  Welzig Heating and Air is always available to assist you, 24 hours day, 365 days a year, providing swift and conscientious service throughout Boulder, Longmont, Louisville, and Lafayette, CO.

Take a look at some of the many advantages of going tankless:

  • Continuous hot water means never running short
  • Save space with a compact water heater mounted on a wall indoors or outdoors
  • Save up to 40% off your utility bill, quickly recovering your investment
  • Protect both your wallet and the environment with efficient tankless water heating
  • Tankless water heaters can be expected to last twice as long as a storage tank option
  • Avoid water that has been stored in a tank with accumulated rust and scale
  • No fear of flooding or damage from a ruptured tank
  • Operating only when warm water is required, tankless units are extremely safe
  • Advanced features include monitoring systems that provide details about water pressure and flow

Satisfied Customers
They Speak For Us

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.


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!

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