Vacation mode reduces water heater operation during trips. Most modern units include this setting on the gas valve or control panel. For trips of 3+ days, vacation mode saves meaningful energy with minimal downside.
How vacation mode works
- Gas atmospheric: rotate dial to "Vacation" position — burner fires minimally to maintain pilot but doesn\'t heat to full setpoint
- Electric: select Vacation mode on digital display — element activates only to prevent freezing/extreme cooling
- Heat pump: Vacation mode on control panel — minimum operation to prevent freeze; resumes normal upon return
- Combi boilers: Vacation mode disables DHW; maintains minimum freeze protection on heating side
When to use vacation mode (vs full shutoff)
Use Vacation mode for trips 3-14 days
- Saves substantial energy vs maintaining full 120°F
- Maintains pilot/freeze protection
- Restores quickly upon return (4-6 hours to full hot)
Use full shutoff for trips 14+ days OR cold storage
- Off-grid cabins shut down for winter
- Snowbird homes left for months
- Houses sold/staged with water turned off
- Combine with draining tank if freezing temperatures expected
Energy savings
Vacation mode saves ~50-70% of water heater energy during use. Typical:
- Gas tank vacation savings: $0.50-1.00/day
- Electric tank vacation savings: $1.00-2.00/day
- Heat pump vacation savings: $0.30-0.60/day
Over a 2-week trip, vacation mode saves $7-28 depending on fuel and rates.
Cold-climate freeze protection
- Vacation mode maintains tank above freezing
- Full shutoff requires draining if freezing temperatures expected
- Power outage during freeze risk: drain tank rather than rely on vacation mode
- For RVs and cabins, full winterization with bypass valves and RV antifreeze is required
What about leaving normal-on?
For trips under 3 days, leaving the water heater at normal setpoint costs $1-3 in unused standby losses but avoids the recovery wait when you return. Most owners leave the unit on for short trips.
Heat pump vacation mode specifics
Heat pump water heaters have stronger vacation-mode savings because the compressor doesn\'t need to overcome large standby losses while you\'re gone. Some HPWHs also let you schedule vacation mode in advance via Wi-Fi (Rheem EcoNet, AO Smith iCOMM).
Bottom line
Use vacation mode for trips 3-14 days. Saves $7-28 typical. For long-term storage or freeze-risk scenarios, full shutoff with appropriate winterization is the right answer. Heat pump owners benefit most from vacation mode use.