Many Orange homes built in the 1950s through the 1970s were plumbed and vented with a tank heater in mind. A gas tankless unit typically draws far more gas while firing than the tank it replaces, uses a different style of venting, needs an electrical outlet, and should have service valves for regular descaling in hard water. Each of those items can add work, and none of them is visible from the outside of the old tank.
Site checks
- Gas supply: can the line from the meter deliver the unit's full input along with the furnace, range and dryer?
- Gas meter: is the meter adequate, or does SoCalGas need to be consulted?
- Venting: where would the new vent exit, and are clearances to windows, doors and property lines workable?
- Electrical: is there an outlet or circuit at the mounting spot?
- Mounting: is there a suitable wall with room for service access?
- Condensate: if it's a condensing model, where will condensate drain?
- Water: are isolation valves with service ports planned for descaling?
- Permits: has the plumber said whether the City of Orange requires one?
Household fit
| Question | Your answer |
|---|---|
| How many showers can run at the same time? | |
| Do you have a large tub to fill? | |
| Do you run out of hot water now? | |
| Will you keep up with descaling? | |
| Do you need hot water during power outages? |
Stay with a tank or convert?
Lean toward a tank if
- Gas line and venting upgrades would be extensive
- You want the simplest, quickest replacement
- Your hot water needs are modest
Lean toward tankless if
- You regularly run out of hot water
- Your gas supply and venting can support it
- You value floor space and will maintain it
Ask before you commit
- What gas line work is needed, and how did you size it?
- Where exactly will the vent terminate?
- Which model and flow rate are you proposing, and why?
- Does the estimate include service valves, permit and old tank disposal?
Common questions
Can a tankless unit use my existing tank vent?
Usually not. Tankless units have their own venting requirements set by the manufacturer.
Do I need to contact SoCalGas?
Possibly, if the added load affects the meter. Your plumber can tell you whether that step is needed.
Is an electric tankless an option?
Whole-house electric tankless units can require substantial electrical capacity. An electrician and plumber can assess whether your panel supports one.
General information for Orange, not a quote or professional advice. In an emergency, call 911.