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UniColorado
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Denver HVAC Contractor

Tankless Water Heater Installation

UniColorado installs tankless water heaters for Denver homes and businesses. Endless hot water, 20+ year lifespan, and space-saving design. Gas and electric models from Rinnai, Navien, and Bradford White. Free estimates for residential and commercial projects.

Tankless Water Heater Installation

Endless hot water20+ year lifespanSpace saving
Appointments available this week
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Tankless Water Heater Installation

Tankless water heater installation in Denver

Tankless Water Heater Installation

On-demand hot water for Denver homes. Gas and electric tankless units from Rinnai, Navien, and Bradford White.

Endless hot water20+ year lifespanEnergy efficient
(303) 250-1000

How It Works

What is a Tankless Water Heater?

A tankless water heater heats water on demand, with no storage tank. When you turn on a hot water tap, cold water flows through the unit and a gas burner or electric element heats it instantly. Because there's no tank to maintain a temperature 24/7, tankless units use 24-34% less energy than traditional tank water heaters according to U.S. Department of Energy data. In Denver, gas tankless models are the most common choice for whole-home installations. Electric tankless units work well for point-of-use applications (single sink or shower), but whole-home electric tankless systems may require a 200A electrical panel upgrade.

What Our Customers Say

5.0
Google Reviews (138)

Chastity O.

My mother debra was a customer of theirs. They did an amazing job. My mom feels they were so hood to her. They were professional and supportive even when problems did arise. She appreciates all you did for her. She would recommend yall to anyone!!

Google Review

Kyle M.

Aydin and team were absolutely fantastic. The install was efficient and smooth. By far the best value that we received quotes for.

Google Review

Michael M.

Afshin and Aydin were great to work with! The whole process from solution design through installation went smoothly, all at a fair price. They were always responsive and the job finished on time. Couldn't recommend more.

Google Review

Colorado's Most Experienced Heat Pump Installer

Tankless water heaters provide endless hot water by heating on demand rather than storing hot water in a tank. We install gas and electric models from Rinnai, Navien, and Bradford White. Gas tankless units require proper gas line sizing (often 3/4" or 1" line) and direct vent or power vent systems. Annual descaling is required in Denver due to hard water. Properly maintained units last 20+ years.

Mitsubishi hyper-heat install, Colorado 2013
2013

Our first hyper-heat install

Lennox heat pump install 2016
2016

Early Lennox cold-climate adoption

Bosch IDS Ultra heat pump install
2024

Bosch IDS Ultra install

Latest cold-climate heat pump installation 2026
2026

Latest cold-climate tech

30+

Municipalities

Master

Licensed & Certified

1000s+

Happy Homeowners

Water Heater Certified

Technicians

100% Satisfaction

Guarantee

Up Front Pricing

No hidden fees

$5M+

Saved for homeowners in 2025

$9,250

Average savings

5,000+

Rebate applications submitted

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Pricing

Tankless Water Heater Installation Cost in Denver

Gas tankless water heater installation in Denver ranges from $3,500 to $6,500 depending on the unit, gas line work, and venting requirements. Electric tankless installation costs $2,000 to $4,000 for point-of-use units, but whole-home electric tankless systems may require an electrical panel upgrade ($4,800 and up additional). Factors that affect cost: • Gas line sizing: Tankless units require higher BTU input than tank water heaters. If your existing gas line is undersized (common in older Denver homes), expect $800 to $2,500 for gas line work. • Venting: Gas tankless units require direct vent or power vent systems. If your existing water heater uses a chimney flue, you'll need new PVC or stainless steel venting ($600 to $1,200). • Electrical requirements: All tankless units need 120V power for the control board, even gas models. Whole-home electric tankless units may require a 200A panel and dual 40-50A breakers. • Permits: Denver requires permits for gas and electrical work. UniColorado handles all permit applications. Competing Denver contractors quote $6,500 to $8,500+ for gas tankless installation according to plumblineservices.com. Floworksplumbing.com quotes $1,200 to $7,500+, though the lower end of that range is unit-only pricing without installation labor.

Tankless vs. Tank Water Heater

Choosing between tankless and tank water heaters depends on upfront budget, hot water demand, and long-term operating costs. **Tank water heaters:** • Lower upfront cost: $1,400 to $3,500 installed in Denver • 8-12 year lifespan • Simple installation with existing gas line and venting • Finite hot water (40-80 gallons depending on tank size) • Lower efficiency, standby heat loss **Tankless water heaters:** • Higher upfront cost: $3,500 to $6,500 installed in Denver • 20+ year lifespan • Endless hot water (as long as flow rate stays below unit capacity) • Space saving (no 60-gallon tank in the mechanical room) • 24-34% more energy efficient (no standby heat loss) • Lower operating costs long-term In Denver, natural gas rates from Xcel Energy make gas tankless units economical for most homes. A typical household saves $100 to $200 per year on gas costs compared to a tank water heater. Over the 20+ year lifespan, that's $2,000 to $4,000 in savings, offsetting the higher upfront cost.

Tankless Water Heater Pros and Cons

**Pros:** • Endless hot water: No recovery time between showers. As long as flow rate stays below unit capacity, hot water is continuous. • 20+ year lifespan: Twice the lifespan of tank water heaters (8-12 years). Rinnai and Navien units routinely exceed 20 years with annual descaling. • 24-34% more energy efficient: U.S. Department of Energy data shows tankless units use 24% less energy for households that use 41+ gallons per day, and 34% less for households that use less than 41 gallons per day. • Space saving: Wall-mounted units free up floor space. A tank water heater occupies 16 square feet of floor space, while a tankless unit occupies less than 1 square foot. • Lower operating costs: Natural gas tankless units cost $100 to $200 less per year to operate compared to gas tank water heaters in Denver. **Cons:** • Higher upfront cost: $3,500 to $6,500 installed in Denver, compared to $1,400 to $3,500 for tank water heaters. • May require gas line upgrade: Tankless units need 150,000 to 200,000 BTU/hr input, which often exceeds the capacity of existing 1/2" gas lines. Upgrading to 3/4" or 1" gas line adds $800 to $2,500. • 10-15 second hot water delay: Cold water sandwich effect. When you turn on a hot water tap, it takes 10-15 seconds for the burner to ignite and hot water to arrive (longer if the fixture is far from the unit). • Limited simultaneous flow rate: A tankless unit sized for 2 simultaneous showers (5 GPM) will struggle if someone starts the dishwasher or washing machine at the same time. Oversized units or multiple units solve this but increase cost. • Requires annual descaling: Colorado has hard water (7-12 grains per gallon in Denver according to Denver Water). Mineral buildup reduces efficiency and can damage the heat exchanger. Annual descaling costs $150 to $250.

Sizing a Tankless Water Heater

Tankless water heaters are sized by flow rate (gallons per minute, GPM), not tank capacity. To size a unit, calculate peak simultaneous hot water demand: • 1 shower: ~2.5 GPM • 1 bathroom sink: ~1.0 GPM • 1 kitchen sink: ~1.5 GPM • 1 dishwasher: ~1.5 GPM • 1 washing machine: ~2.0 GPM For example, if your household runs 2 showers simultaneously during morning rush hour, you need 5 GPM minimum. Denver's cold incoming water temperature (40-50°F in winter) requires higher BTU output to achieve the desired hot water temperature (120°F). A unit rated for 5 GPM in warm climates may only deliver 4 GPM in Denver during winter. **Recommended units for Denver:** • Rinnai RU199iN: 11 GPM, 199,000 BTU, handles 4 simultaneous showers in Denver winter conditions. Most popular choice for large families. • Navien NPE-240A: 11.2 GPM, 199,900 BTU, condensing efficiency (96% AFUE), built-in recirculation pump for instant hot water. • Bradford White AeroTherm: 10 GPM, 180,000 BTU, traditional reliability, lower upfront cost. For a typical Denver household (2-3 people, 2 bathrooms), a 7-9 GPM unit handles most scenarios. For larger families (4+ people, 3+ bathrooms), a 10-11 GPM unit prevents flow rate bottlenecks during peak demand.

Brands We Install

UniColorado installs tankless water heaters from Rinnai, Navien, and Bradford White. These are the three most reliable brands for Denver's climate and water conditions. **Rinnai:** The most popular tankless brand in the U.S., with a 25+ year track record. Rinnai units are known for longevity and parts availability. The RU199iN model is our most common installation for whole-home Denver applications. Rinnai's ControlR smartphone app allows remote temperature adjustment and diagnostics. **Navien:** Excellent condensing efficiency (96% AFUE) and built-in recirculation pumps for instant hot water. The NPE-240A model is the best choice for households that want near-instant hot water at every fixture. Navien units cost $200 to $500 more than comparable Rinnai models but save $30 to $50 per year in gas costs. **Bradford White:** Traditional reliability with lower upfront cost. Bradford White AeroTherm units are a good choice for budget-conscious homeowners who want proven performance without the premium features of Rinnai or Navien. Parts availability is excellent, and local plumbing supply houses stock Bradford White replacement parts. All three brands handle Denver's hard water well with annual descaling. We do not recommend off-brand tankless units (EcoSmart, Titan, Stiebel Eltron) due to parts availability issues and shorter lifespans.

Frequently Asked Questions

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