Gas vs. electric water heaters in Colorado homes

Choosing between gas and electric is mostly about what your house already has, how much hot water you use at once, and how you weigh up-front cost against operating cost. Here's how they compare in a Colorado home.

How they differ

• Recovery: gas burners put more heat into the water per hour than standard electric elements, so a gas tank refills with hot water faster. That's why households with back-to-back showers often prefer gas.
• Venting: gas heaters need a flue or vent and adequate combustion air. Electric tanks don't vent at all, which makes them easier to place.
• Installation: electric tanks need a dedicated circuit; gas tanks need a properly sized gas line, shutoff and sediment trap.
• Power outages: many standard gas tanks with standing pilots keep heating without power. Power-vent gas models and all electric models need electricity.

Operating cost factors

Which costs less to run depends on your utility rates, how much hot water you use and the efficiency of the specific model. Compare the yellow EnergyGuide labels, which estimate yearly operating cost, rather than relying on rules of thumb.

Heat pump water heaters

A heat pump (hybrid) electric water heater moves heat from the surrounding air into the water instead of making it with elements. They're much more efficient than standard electric tanks, but they're taller, need a certain volume of surrounding air, make some fan noise, and cool the room they sit in, which matters in a Colorado basement in winter. They also need a condensate drain.

Colorado's low-NOx rule and gas

HB23-1161 sets low-NOx emission limits for new natural-gas water heaters sold in Colorado from January 1, 2026; compliant models are on the market and ENERGY STAR-certified models are treated as compliant. It doesn't ban gas water heaters. Propane models have until 2031 under SB26-002.

Switching fuels

Going from electric to gas means running a gas line, adding venting and confirming combustion air. Going from gas to electric means a new dedicated circuit, which may require panel capacity, and capping the old gas line. Both are doable; they're just more than a swap.

Questions to ask before you choose

• What fuel is the house already set up for, and what would switching involve?
• How many people shower in the morning, and how close together?
• Is there a sound chimney or vent path for a gas heater, or room and air volume for a heat pump?
• Does the electrical panel have capacity for a dedicated water heater circuit?
• How long do you plan to stay? A higher-efficiency model pays back over years, not months.

When the question comes up

• You're replacing a water heater and wondering whether to switch
• You run out of hot water often
• Your gas vent or chimney has problems
• You're finishing a basement and want flexibility on placement
• You want better efficiency

How a visit goes

1. Check what the house hasGas supply, venting, electrical panel and space.
2. Talk about your useHow many people, showers and appliances.
3. Compare optionsGas, standard electric, heat pump and tankless, with real trade-offs.
4. Install the one you chooseWith supply, venting and permit handled.