Running out of hot water, paying to keep 50 gallons heated around the clock, or dealing with an on-demand system that underperforms in Denver’s thin air — A Clear Choice Plumbing and Heating provides expert tankless water heater installation in Denver CO that solves all three. Every installation is altitude-derated for 5,280-foot performance, gas-line assessed, and fully permitted with the City of Denver.
Denver is one of the top markets in the United States for tankless water heater adoption — driven by energy-conscious homeowners in neighbourhoods like LoHi, Washington Park, Capitol Hill, and RiNo who want unlimited hot water, lower energy bills, and a 20+ year appliance lifespan. But Denver’s Mile High elevation introduces a technical challenge that separates quality installations from poor ones: altitude derating.
At 5,280 feet, the reduced atmospheric pressure means a tankless water heater rated at 199,000 BTU at sea level delivers approximately 167,000 BTU in Denver — a 16% reduction in heat output. Without altitude adjustment, the unit struggles to meet demand under simultaneous hot-water use, triggering cold-water complaints and error codes. Every A Clear Choice tankless installation in Denver includes a full altitude derating calculation, correct gas valve adjustment, and performance testing under simulated peak demand — so the unit delivers what it’s rated for at Mile High.
New Tankless Installation
Altitude Derating
Gas Line Assessment
Venting Configuration
Tankless Repair
Annual Descaling
Altitude-derated, gas-line assessed, fully permitted — all in one all-in project price.
A Clear Choice provides complete tankless water heater installation and service across Denver — from the city’s historic Capitol Hill Victorians to modern Cherry Creek townhomes. Here’s what our Denver tankless service includes:
Altitude Derating — Denver’s Most Critical Installation Step
At 5,280 feet, every gas-fired tankless unit must be derated for altitude. We calculate the correct BTU output for Denver conditions, adjust the gas valve, and test under peak demand before completing the installation — ensuring the unit performs as rated, not as it would at sea level.
Navien Installation & Service
Navien’s NPE condensing series is one of our most-installed tankless brands in Denver — particularly its built-in recirculation capability, which is valuable in larger Capitol Hill and Washington Park homes where long pipe runs would otherwise mean extended wait times for hot water.
Rinnai Installation & Service
Rinnai’s RL and RUR series are industry-leading in reliability and have one of the widest service networks in Colorado. We install and service all Rinnai models and carry Rinnai-compatible parts for Denver service calls.
Gas Line Assessment & Upsizing
Tankless units require 150,000–199,000 BTU — significantly more than conventional tanks. Many Denver homes built before 1990, particularly in historic districts like Congress Park and Five Points, have gas supply lines sized for lower-BTU appliances. We assess and upgrade as needed, included in our project quote.
Tank-to-Tankless Conversion in Existing Denver Homes
Converting from a tank unit to tankless in a Denver home requires careful assessment of the existing mechanical room, venting options, gas supply, and water hardness zone. We design the conversion for your specific property and neighbourhood conditions — not a generic retrofit.
Annual Descaling & Preventive Maintenance
Even in Denver’s relatively soft Northern System zones, annual descaling is recommended for tankless systems. For Southern System zones (parts of Park Hill, Green Valley Ranch, and Aurora border areas) with harder water, bi-annual descaling may be appropriate. We set a maintenance schedule based on your specific water supply.
Denver Permit & Inspection Handling
Tankless water heater installation in Denver requires a permit and a city inspection. We submit the application, coordinate the inspector, and provide all permit documentation as a standard part of every installation — no separate process for you to manage.
Altitude Derating — Denver’s Most Critical Installation Step
At 5,280 feet, every gas-fired tankless unit must be derated for altitude. We calculate the correct BTU output for Denver conditions, adjust the gas valve, and test under peak demand before completing the installation — ensuring the unit performs as rated, not as it would at sea level.
Navien Installation & Service
Navien’s NPE condensing series is one of our most-installed tankless brands in Denver — particularly its built-in recirculation capability, which is valuable in larger Capitol Hill and Washington Park homes where long pipe runs would otherwise mean extended wait times for hot water.
Rinnai Installation & Service
Rinnai’s RL and RUR series are industry-leading in reliability and have one of the widest service networks in Colorado. We install and service all Rinnai models and carry Rinnai-compatible parts for Denver service calls.
Gas Line Assessment & Upsizing
Tankless units require 150,000–199,000 BTU — significantly more than conventional tanks. Many Denver homes built before 1990, particularly in historic districts like Congress Park and Five Points, have gas supply lines sized for lower-BTU appliances. We assess and upgrade as needed, included in our project quote.
Tank-to-Tankless Conversion in Existing Denver Homes
Converting from a tank unit to tankless in a Denver home requires careful assessment of the existing mechanical room, venting options, gas supply, and water hardness zone. We design the conversion for your specific property and neighbourhood conditions — not a generic retrofit.
Annual Descaling & Preventive Maintenance
Even in Denver’s relatively soft Northern System zones, annual descaling is recommended for tankless systems. For Southern System zones (parts of Park Hill, Green Valley Ranch, and Aurora border areas) with harder water, bi-annual descaling may be appropriate. We set a maintenance schedule based on your specific water supply.
Denver Permit & Inspection Handling
Tankless water heater installation in Denver requires a permit and a city inspection. We submit the application, coordinate the inspector, and provide all permit documentation as a standard part of every installation — no separate process for you to manage.
At 5,280 feet, atmospheric pressure is about 17% lower than at sea level. Gas-fired tankless water heaters rely on precise air-to-fuel ratios for combustion. Without altitude derating — adjusting the gas valve and fan settings for Denver’s thinner air — the unit runs rich, produces less heat than rated, and can generate error codes under load. A tankless unit installed without altitude adjustment in Denver will underperform, and the homeowner often doesn’t know why. We derate every installation to Mile High specifications.
Total installed cost for a residential tankless installation in Denver typically runs $1,900–$3,700 — including the unit, altitude derating, gas line assessment and any required upgrade, venting, installation labor, permit, and disposal of the old heater. Navien and Rinnai condensing models with recirculation capability are toward the top of this range. We provide a complete all-in itemised quote after the site assessment.
For most Denver homeowners planning to stay in their home 5+ years, yes. The higher upfront cost versus a conventional tank replacement is typically offset within 4–7 years through energy savings — tankless units operate at 90–98% efficiency versus 60–70% for tanks. Denver’s relatively soft water (Northern System) means descaling frequency is lower than in harder-water suburbs, improving long-term economics. You also eliminate running out of hot water permanently.
Yes — annual descaling is the most important maintenance task. Even in Denver’s Northern System zones with relatively soft water, mineral scale accumulates inside the heat exchanger over time. Skipping descaling progressively reduces efficiency and eventually triggers flow errors. We also recommend checking the air intake filter and testing the pressure relief valve annually. Our maintenance program handles all of this.
Interested in a tankless water heater installation in Denver? Call us now or request your free, no-pressure estimate. A Clear Choice installs every Denver tankless system altitude-derated, gas-line assessed, fully permitted, and tested for peak performance before we leave.
Serving Capitol Hill, LoHi, Washington Park, Cherry Creek, RiNo, and all of Denver — the altitude-aware tankless specialists Mile High homeowners trust.
