Tankless Water Heater Houston
Tankless water heater mounted on a wall with isolation valves and venting

On-demand water heater installs

Houston Tankless Water Heater Installation

Tired of a tank that runs cold or eats garage space? Get an on-demand unit sized, vented and piped for your home.

Call (832) 783-9416
•Tank-to-tankless conversions
•Fuel line and vent sizing
•Indoor and outdoor units

The job

Tankless Water Heater Install Houston: What It Covers

Isolation valves and flush ports under a tankless water heater

A tankless install is mostly about what surrounds the unit. The installer sizes it by flow rate, checks that the gas line or panel can carry the load, plans the vent path and adds service valves so the unit can be descaled later.

Tankless hot water heater installation also includes a pressure relief valve, a condensate drain for condensing models and freeze protection for outdoor units. A City of Houston plumbing permit and inspection are part of the job.

Most tankless installation work takes a day for a simple swap and longer for a conversion that needs new gas pipe or venting.

Step by step

Installing Tankless Water Heater Units: Step by Step

  1. 01

    Size it

    Count the fixtures that run together and size for the coldest inlet water of the year.

  2. 02

    Check fuel or power

    Measure the gas line run and meter capacity, or confirm panel space for electric units.

  3. 03

    Plan the vent

    Route PVC or stainless venting to an approved termination away from windows and doors.

  4. 04

    Mount and pipe

    Hang the unit, add isolation valves, the relief valve and a condensate line where needed.

  5. 05

    Test

    Fire the unit, check gas pressure and temperature at the taps, and show you the controls.

Gas, venting and power

Tankless Water Heater Installation Houston: Gas, Venting and Power

Gas units draw far more fuel at full fire than a tank, so the gas pipe often has to be upsized from the meter. Electric units can need 120 to 160 amps of dedicated circuits, which some older panels cannot spare.

Outdoor models skip indoor venting and suit many garages and exterior walls in Houston, TX, but they need power for freeze protection. Indoor condensing models vent through PVC and need a drain.

  • Gas: line size, meter size and a sediment trap
  • Vent: material, length and termination clearances
  • Power: outlet for gas units, dedicated circuits for electric
  • Water: isolation valves and a filter on the inlet

Thinking about tankless? Get the gas line checked before you buy.

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Choosing installers

Tankless Water Heater Installers: What to Ask

Good tankless water heater installers ask about your household before naming a model. Useful questions to ask back:

  • What flow rate do you recommend, and at what inlet temperature?
  • Does my gas line or panel need an upgrade, and is it in the quote?
  • Will you install isolation valves for descaling?
  • Is the City permit included?

Expect a typical installed range of about $1,200 to $1,800 for electric units and $1,500 to $2,800 for gas units, before conversion work. A full tankless water heater in Houston comparison is on the home page.

Install questions

Installation Questions

Can I install a tankless water heater myself?

Texas law lets a homeowner do plumbing on their own homestead, but gas, venting and electrical work carry real risk, and local permit rules still apply.

How long does a tankless install take?

A same-spot replacement often takes a day. A conversion from a tank can take longer because of gas pipe, venting or circuits.

Can it go in the attic?

Some units can, with a drain pan and service access, but garages and exterior walls are easier to vent and maintain.

Do I need a water softener?

Not always. Houston water is moderately hard, so a softener or scale filter can cut descaling, but yearly flushing works without one.

What size unit do I need?

Homes with two or three bathrooms usually need a gas unit around 8 to 10 gallons per minute. The installer confirms it from your fixtures.

Plan Your Tankless Install

Tell us about your current water heater and fuel, and we'll put you through to a local installer in Houston, Texas.

Call (832) 783-9416