Tankless · High Efficiency
Endless hot water with Navien & Rinnai systems.
Upgrade your Billings home to continuous on-demand hot water. Save space in your basement mechanical room, eliminate standby heat loss, and cut water heating energy bills by up to 30%.
High-quality plumbing standards built specifically for Montana homes
Run multiple showers, laundry, and dishwasher simultaneously without ever running out of hot water.
Double the operational life of traditional storage tanks with replaceable stainless steel heat exchangers.
Frees up valuable basement floor space in your utility closet or mechanical room.
Includes heavy-duty service valves for annual vinegar mineral descaling to defeat Billings hard water.

Professional Tankless Water Heaters for residential properties in Billings, MT.
Expert answers from Victor and the T-12 team
Yes. We size Navien and Rinnai condensing units specifically for Montana's cold incoming groundwater (which drops to 38°F in January). We calculate the necessary BTU input and temperature rise so your showers stay steaming hot all winter.
In many cases, tankless units require a 3/4-inch gas supply line due to higher instantaneous BTU demand (180,000 to 199,000 BTUs). T-12 Plumbing verifies your gas manifold and handles all gas line sizing safely.
Due to Billings' high mineral content, tankless units should be flushed annually with a food-grade descaling solution or vinegar. We install service isolation valves on every install to make this simple.
Full-service residential plumbing for Yellowstone County
2–4 fleet trucks dispatched daily from West End Billings
Contact T-12 Plumbing Corporation for an honest tankless conversion assessment.