Tankless water heater installation in Denver.
A successful tankless conversion starts with flow demand, fuel supply, venting, and the way your household actually uses hot water—not the equipment label alone.
Start with the decision in front of you.
Tank vs. tankless guide
Compare the two paths around household demand, space, and priorities.
Explore →02Tankless installation cost
How gas, venting, sizing, and recirculation affect conversion cost.
Explore →03Denver tankless conversion guide
Altitude, venting, gas supply, sizing, and recirculation in one decision guide.
Explore →First, confirm that tankless fits the home
We review peak flow, incoming water temperature, gas-line capacity, venting path, electrical needs, and whether recirculation matters to you.
- ✓Simultaneous fixture demand
- ✓Gas meter and line capacity
- ✓Venting route and condensate
- ✓Maintenance access and water quality
Know the scope before the work starts
OneLine uses flat-rate quoting so the work, assumptions, and included items are visible before the job begins. The price we quote is the price you pay.
- ✓Written scope before work
- ✓Permit and inspection requirements identified
- ✓Connected electrical, plumbing, or HVAC work considered
- ✓No hourly surprise at the end
If our workmanship causes a problem, we'll fix it.
Qualifying work includes a 5-year labor guarantee, applicable parts coverage, and insured service. Coverage, parts coverage, and exclusions are provided in writing before work begins.
Flat-rate price before work begins. No work starts without your approval.
Tell us what is going on at your place.
Share the basics and we’ll route the request to the right service line. We'll text you ASAP to continue the conversation, then a One Line specialist will reach out as soon as possible.
- ✓Flat-rate scope before work
- ✓Electrical, HVAC, and water-heater team
- ✓Denver metro service area