Gas demand and line size
We match pipe size and length to the unit's gas input so it gets the supply it needs.
A tankless water heater can need a larger gas line than the tank heater it replaces. Appliance Doctor's gas team installs and upgrades the gas piping for tankless water heaters across Panama City and Northwest Florida.
Tankless water heaters heat water on demand, so they need a lot of gas at the moment you open a hot tap. If the pipe is too small, too long, or fed by an undersized meter, regulator, or tank, the unit can fail to ignite or shut down, and the water runs cold.
Before we recommend a plan, we compare the unit's gas demand with the existing piping and the capacity of your meter or propane tank. Then we size and run the line to match.
We match pipe size and length to the unit's gas input so it gets the supply it needs.
The unit, the regulator, and the supply must all agree on the fuel. See natural gas vs. propane.
A proper shutoff, a correct connection to the unit, and a leak check are part of the job.
Existing meters and propane tanks may need to be evaluated or upgraded. See gas piping & propane tanks.


We handle the gas piping. We coordinate with your plumber or water heater installer for the unit, the venting, and the water connections. Gas work should always be done by a licensed professional. Appliance Doctor holds a Category V LP Gas Installer license (Florida License #LI14261). Call us to confirm what we will handle on your project.
Often, yes. A tankless unit can draw much more gas at once than a tank water heater, so the pipe size, length, and the meter or tank capacity all matter. We check the unit against the existing piping before recommending a plan.
Yes, if the unit and the gas supply are set up for propane. Tell us the fuel type. See our natural gas vs. propane guide and propane tank installation.
Our work focuses on the gas piping. We coordinate with your plumber or water heater installer for the unit, venting, and water connections. Call us to confirm what we will handle on your project.
Requirements vary by location and project. Every project is checked for scope, code rules, and schedule, and we tell you what to expect.
“Appliance Doctor, Steve is professional and very thorough as well as being licensed and insured. He was recommended to me by the gas company. Give him a call you won't be sorry.”
- S. T. · Panama City, FL · Nextdoor, 2023Call during normal business hours (Monday-Friday, 8:00 AM-4:00 PM) or send a service request online. We reply within one business day.