Water Heaters
Gas vs. Electric Tankless Water Heaters: A Houston Homeowner's Guide
Choosing between a gas and an electric tankless water heater is one of the biggest calls a Houston homeowner will make during a remodel or replacement. Here's how they compare on the things that actually matter — upfront cost, installation, hot water capacity, and monthly bills.
Higher flow rate, best for whole-home use in Houston's larger homes. Needs a gas line and proper venting.
Lower install cost, compact, and easy to place. Best for point-of-use or smaller homes/apartments.
Cost in the Houston market
Electric tankless units typically run $500–$1,500 for the equipment, with installs in the $1,500–$3,000 range depending on panel capacity. Gas tankless units cost $1,000–$2,500 for the unit, and installed prices in the Houston area commonly land between $3,000 and $5,500 when venting and gas line work is included. Natural gas is inexpensive in Texas, so gas units usually win on operating cost over their 15–20 year lifespan.
Installation requirements
- Gas: requires a properly sized gas line, sealed combustion venting, and (for many models) a condensate drain. Retrofits often mean upgrading the gas line from the meter.
- Electric: requires enough spare capacity in your electrical panel — most whole-home units need two or three 40-amp double-pole breakers and heavy-gauge wiring. A lot of older Houston homes need a panel upgrade first.
Capacity for Houston homes
Houston groundwater comes in around 70–75°F for most of the year, which is friendly to tankless performance. A mid-size gas unit will comfortably deliver 6–8 gallons per minute — enough to run two showers plus a dishwasher. Electric units usually top out at 4–6 GPM whole-home, which is fine for 1–2 bathroom homes but tight for larger families.
Energy efficiency and monthly bills
Electric tankless units are ~98% efficient at the appliance, versus 82–96% for gas. But because natural gas is cheaper per BTU than electricity in Texas, gas tankless units typically cost less to operate month-to-month. The Energy Star rebates and manufacturer incentives on high-efficiency condensing gas models can also offset the higher install cost.
Which one is right for you?
- Whole-home replacement in a 3+ bedroom Houston house with existing gas → gas tankless.
- Townhome, condo, or ADU with no gas line → electric tankless.
- Point-of-use (garage sink, remote bathroom) → electric tankless.
- Older home with an undersized panel and existing gas → gas tankless avoids a panel upgrade.
Not sure which one fits your home?
DGO Plumbing installs both gas and electric tankless water heaters across the Greater Houston area. We'll size the unit correctly and quote the full install — no surprises.