Same-Day Service
Most service calls handled same-day across the Denver metro — and we answer the phone 24/7.
Hot Water Without Limits
Tankless Water Heater Installation and Service for Denver Homes
A tankless water heater heats water on demand — only when you need it — instead of keeping 40 or 50 gallons hot around the clock. The result is an essentially unlimited supply of hot water, no standby heat loss, and a unit that takes up a fraction of the space of a traditional tank. For the right home, it’s a genuinely better system. For the wrong home, it’s an expensive mismatch. Done will tell you which camp you fall into before recommending anything.
One important note for Denver homeowners: our hard water requires diligent descaling maintenance on tankless units, or performance degrades quickly. We install systems with this in mind and explain exactly what upkeep looks like. If you’d like to compare options, visit our water heater services page or check out our water quality treatment services — a whole-home water softener pairs extremely well with a tankless system here in Denver.
- Endless Hot Water Tankless systems heat water as it flows through the unit, so the supply is continuous. No more cold showers at the end of the line.
- Energy Savings on Standby Loss Traditional tanks heat and reheat stored water all day. Tankless units only fire when hot water is called for — which can meaningfully reduce your water heating energy use.
- Space-Saving Wall-Mount Design A tankless unit mounts on the wall and is roughly the size of a large briefcase — freeing up floor space in utility closets, mechanical rooms, or garages.
Is Tankless Right for You?
Signs You Might Benefit from a Tankless Upgrade
Tankless systems aren't for everyone, but they're an excellent fit in these common scenarios.
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Your Household Keeps Running Out of Hot Water
If a household with multiple showers, a dishwasher, and a washing machine is constantly fighting over hot water, a tankless system eliminates the bottleneck entirely.
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Your Tank Water Heater Is Near End of Life
If you're already facing a replacement, it's the natural moment to consider whether a tankless upgrade makes sense. The installation infrastructure is already being touched, which reduces the incremental cost of going tankless.
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You Need to Free Up Space
A 50-gallon tank takes up significant floor space. If your utility room is cramped or you want to reclaim that area, a wall-mounted tankless unit is a dramatic improvement.
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You're Planning to Stay in the Home Long-Term
Tankless systems have a higher upfront cost than tank units. They make the most financial sense for homeowners who plan to be in the house long enough to recoup that investment through energy savings and a longer equipment lifespan.
What We Install and Service
Done's Tankless Water Heater Capabilities
We handle every aspect of tankless water heater installation, maintenance, and repair in Denver.
- Gas Tankless Installation Natural gas tankless water heaters offer the fastest flow rates and are the most common choice for whole-home applications in Denver. We assess your gas line capacity and upgrade it if needed as part of the installation.
- Electric Tankless Installation Point-of-use electric tankless units are ideal for supplementing hot water at a distant fixture or in an addition. We assess electrical panel capacity and size the unit correctly.
- Descaling and Maintenance Denver's hard water requires annual descaling of tankless heat exchangers — skipping this maintenance leads to sharply reduced flow and premature failure. We offer maintenance visits to keep your system performing.
- Tankless Repair Error codes, ignition failures, flow sensor issues, and heat exchanger problems — Done's plumbers are trained on major tankless brands and can diagnose and repair most issues on the first visit.
Our Installation Process
How Done Handles Tankless Water Heater Installations
Tankless installation is more involved than a tank swap, but our process keeps it organized and stress-free.
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Honest Needs Assessment
Before recommending a tankless system, we evaluate your household hot water demand, gas line size, venting options, and water hardness. If tankless isn't the best fit, we'll tell you — and explain what is.
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System Selection and Sizing
Tankless units are rated by flow rate (GPM). We select a unit sized for your peak demand — not the minimum that'll barely work, and not an oversized unit that adds unnecessary cost.
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Professional Installation
We handle all gas line work, venting, water connections, and electrical requirements. Everything is brought up to Denver code and tested thoroughly before we leave.
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Walkthrough and Maintenance Plan
We show you how to use the system, explain the annual descaling requirement, and make sure you know how to reach us if anything comes up. Setup support is part of the job.
Current Specials
Save on the work your home needs most.
Plumbing
$83
$83 Drain Clearing
Clear any clogged drain
Expires 12/31/2026
Plumbing
Up to $750 OFF
Up to $750 Off a New Water Heater
Tank or tankless water heater replacement
Expires 12/31/2026
Plumbing
$99
$99 Water Heater Tank Flush & Safety Check
Flush, inspect, and extend your water heater's life
Expires 12/31/2026
Plumbing
$50 OFF
$50 Off Plumbing Service
Any plumbing, sewer or drain service
Expires 12/31/2026
Why Choose Done
Upfront Pricing
Flat-rate pricing approved before work begins — no surprises on the invoice.
Licensed & Insured
Fully licensed, bonded, and insured — plumbing, HVAC, and electrical under one roof.
Satisfaction Guaranteed
If it isn't right, we make it right — backed by our workmanship guarantee.
Interested in Going Tankless?
Call 833-539-9153 for an honest assessment — we'll tell you whether a tankless system makes sense for your Denver home.
What Our Customers Say
Don't just take our word for it — hear from our satisfied customers
★★★★★
I've been using this company for years now, both for my own home and for a rental property, for everything from basic leaks to a new underground sewer line. They're always very prompt and professional, and provide options without being pushy. Today's service guy, Robby, asked how much technical detail I wanted to know, and explained the problem and repair options at my level.
★★★★★
Charles came to my home today with a great attitude he was calm effective and a joy to be around. He is wonderful and descriptive in a way I can understand
Maintenance Membership
Join the Care Club
Total home service care, on a schedule.
Members get priority scheduling, seasonal HVAC tune-ups, an annual plumbing & electrical safety inspection, and exclusive discounts — for less than the cost of a single emergency call.
- Priority scheduling
- Seasonal HVAC tune-ups
- Annual safety inspection
- Exclusive member discounts
- Free dispatch on repairs
- No long-term contracts
Frequently Asked Questions
How much does a tankless water heater cost to install in Denver?
Installation cost varies based on the unit size, whether gas line or venting upgrades are needed, and whether an existing tank needs to be removed. We give you a full, itemized quote before any work begins — no estimates that balloon later. Financing is available if the upfront cost is a concern.
Does Denver's hard water cause problems for tankless water heaters?
Yes, and it’s something we’re upfront about. Calcium scale builds up inside the heat exchanger faster in Denver than in softer-water cities. Without annual descaling, a tankless unit’s flow rate drops and the heat exchanger can fail prematurely. We recommend pairing a tankless system with a water softener or treatment system to reduce maintenance demands and extend the unit’s life.
Can a tankless water heater supply my whole house?
A properly sized whole-home gas tankless unit can supply multiple simultaneous fixtures — showers, dishwasher, laundry — without running out. The key word is ‘properly sized.’ Undersizing is the most common installation mistake. Our plumbers calculate your peak demand before recommending a flow rate.
How long do tankless water heaters last?
With proper maintenance — including annual descaling in Denver’s hard-water environment — tankless units typically last 15–20 years, meaningfully longer than a standard tank water heater. That longer lifespan is part of what makes the higher upfront cost worthwhile for homeowners planning to stay in their home long-term.
*Offers cannot be combined with other promotions or applied to dispatch fees. No cash value. Must present offer at time of service. Call for details.
