Tank vs tankless, day to day
Storage tank
- Keeps a tank of hot water ready.
- Can run out during long or back-to-back showers.
- Simpler installation when replacing like for like.
- Takes up floor space in a garage or closet.
Tankless
- Heats water on demand, so it does not run out the same way.
- Output is limited by flow rate; several fixtures at once can strain it.
- Often needs gas line, venting and electrical changes.
- Mounts on a wall, freeing floor space.
Why installation is the big question
Swapping a tank for a tankless unit in an older Buena Park home is rarely a straight exchange. A gas tankless heater can need much more gas at full output than an older tank, so the existing gas line may need to be upsized. Venting is different, and many units need an electrical outlet nearby for controls.
Those changes are where most of the variation in a tankless project comes from. A careful plumber will look at your gas meter, the route of the gas line, the location of the heater and where venting can exit before recommending a model.
Questions for the plumber
- Is my existing gas line large enough, or will it need to be upsized?
- Where will the unit and its venting go?
- Does it need an electrical outlet, and is one nearby?
- How many fixtures can run at once with this model?
- Will service valves for descaling be installed?
- What permit is needed, and will gas work be inspected?
- What is your CSLB license number?
What drives the cost of a tankless switch
| Factor | Why it matters |
|---|---|
| Unit type and size | Higher-output and condensing models differ in price and venting. |
| Gas line changes | Upsizing a line from the meter can be a significant part of the job. |
| Venting | New vent routing and materials depend on the model and location. |
| Electrical | Some installs need a new outlet or circuit. |
| Location change | Moving the heater means new water and gas runs. |
| Permits | Check with the city for current requirements. |
Quick facts
- Gas service
- SoCalGas
- License check
- cslb.ca.gov
- Local water
- Hard; plan for descaling
- Permits
- Check with the City of Buena Park
Common questions
- Do tankless heaters need maintenance?
- Yes. With hard water, periodic descaling is usually recommended by the manufacturer. Ask the installer how often for your household.
- Do I still need seismic straps?
- Wall-mounted tankless units are installed differently from tanks. Ask the plumber how the unit will be secured to meet code.
- Will a tankless unit give me instant hot water?
- Not necessarily. Water still has to travel from the heater to the fixture. Ask about recirculation options if that matters to you.
General information for Buena Park, not a quote or professional advice. In an emergency, call 911.