Water heater decision guide
Tankless vs Tank Water Heater in Colorado: 2026 Brighton Cost & Lifespan Guide
Last updated: 2026-05-11. Written by the crew at Brantley & Sons Plumbers LLC, Brighton, CO 80603.
Quick answer. For most Brighton homes, a quality 50 gallon tank is the right buy. Tankless makes sense if you have two teenagers taking long showers, a soaking tub, or you plan to stay 15+ years. Tankless install runs $3,900 to $6,400 including venting and possible gas line upsize. A tank install runs $1,400 to $2,600. Tankless wins on lifespan and energy. Tanks win on install cost and simplicity. Full options on our
water heater installation page.
Call 720 664 0815 to talk through your exact house.
We get asked this in almost every quote we write. Here is the honest version instead of the marketing version.
How each one actually works
A tank water heater keeps 40, 50 or 75 gallons of water hot 24 hours a day. You use a gallon, it heats another gallon to replace it. When you drain the tank faster than it can recover, you run out of hot water.
A tankless water heater stays cold until you turn on hot. Then it fires a powerful burner or electric element around a heat exchanger and heats the water as it passes through. In theory you cannot run out. In practice, flow rate is the limit.
The Colorado specific stuff most guides skip
- Incoming water temperature. Brighton city water in January is cold, often 42 to 48 degrees F. Tankless units are rated at a 70 degree F rise, so a 9 gpm tankless can still deliver its rated flow in summer and drop to about 7 gpm in winter. Sizing matters.
- High altitude derating. Brighton sits at 4,985 feet, Commerce City a little lower. Some gas appliances need high altitude orifice kits or rating adjustments. Any reputable installer handles this, but ask.
- Hard water. Parts of the north metro pull harder water. Hard water scales the narrow heat exchanger in a tankless faster than the open tank of a tank heater. Annual descaling is part of owning a tankless here.
- Condensate. Modern condensing tankless models produce acidic condensate water. It needs a drain that will not corrode and in some cases a neutralizer.
Side by side
| Factor | Tank (50 gal gas) | Condensing tankless |
|---|
| Installed cost, Brighton 2026 | $1,650 to $2,450 | $3,900 to $6,400 |
| Expected lifespan | 10 to 14 years | 18 to 22 years |
| Simultaneous hot showers | 2 to 3 before recovery lag | 2 to 3 depending on model, winter flow |
| Continuous hot water | No, tank drains | Yes |
| Energy use (typical) | Higher, standby losses | 25 to 35 percent lower |
| Maintenance | Annual drain and flush | Annual descale, condensate check |
| Gas line required | 1/2 inch usually OK | 3/4 inch usually required |
| Venting | Atmospheric or power vent | Sealed combustion, PVC or stainless |
| Space | Takes a closet | Wall mount, roughly 28 by 18 inches |
| Failure mode | Leaking tank, usually gradual | Electronics or heat exchanger, often sudden |
Who should pick tankless
- Households of 4 or more with two daily showers and morning overlap.
- Owners of a soaking tub, a large jetted tub, or a rough in for a future basement bathroom.
- Homeowners staying 10 or more years.
- Anyone who values the floor space the tank takes up.
- Second home owners who want to shut the system off for weeks and still ramp quickly.
Who should stay with a tank
- 1 to 3 person households.
- Anyone selling in 3 years. The payback is not there.
- Homes where the gas line would need significant upsizing.
- Homes on well with high hardness who do not have a softener.
A word on hybrid heat pump water heaters. These are excellent in the right house. They want a 1,000 cubic foot conditioned space, they cool the air around them, and they save more energy than tank or tankless. The catch is noise and cold output air. Ask us if your basement utility area fits.
What we install most
- Bradford White tanks in most Brighton and Commerce City installs.
- Rinnai RU199 condensing tankless for whole home retrofits.
- Navien NPE 240A2 with a recirculation buffer for instant hot water.
Common pitfalls we clean up after
- Tankless dropped in with a 1/2 inch gas line. Unit short cycles or throws ignition codes under load. Fix: upsize to 3/4.
- Tankless vented horizontally with the wrong slope. Fix: rebuild the vent with positive pitch to the outside.
- Condensate run into a galvanized drain. Fix: replace with PVC or a neutralizer upstream.
- Tank installed without expansion tank on a closed loop PRV system. Fix: add an expansion tank to protect the T and P valve.
FAQ
Will a tankless unit run during a power outage?
No. Even gas units need power for the ignition and control board. A standard tank without electronic ignition will keep delivering whatever is in the tank until it cools.
Do rebates help the tankless math?
Colorado utility rebates on high efficiency water heaters change year to year. We check current offers before we quote so you are not missing money.
Can you convert from tank to tankless without moving the location?
Usually yes, with a wall mount conversion kit or bracket. The bigger question is whether the gas line and vent path support it.
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