Pool Energy Efficiency
A savings percentage without weather, water temperature and hours uncovered cannot describe your pool’s operation. Record those inputs and the equipment schedule before estimating savings. This page provides an input log and an assumed recording example, not a measured efficiency result.
Which conditions should be logged?
EPA’s WaterSense at Work guidance identifies water temperature, ambient conditions, air movement and exposed water area as evaporation factors. It discusses covering unused pools and limiting water-feature use. Record climate and weather for the measurement period rather than assigning one fixed climate label.
Use consistent units and keep the source with each observation: local sensor, weather station, controller log or operator record. The table below is an editorial recording aid, not an evaporation formula.
How do cover use and pump duty enter the record?
Record when the cover is actually closed and whether a spa or feature remains exposed. Keep those hours alongside heating and pump schedules. A cover-use assumption is not established merely because a cover has been installed.
ENERGY STAR distinguishes filtration duty from higher-flow operations. Ask the equipment designer to check whether the pump duty is excessive or the system resistance is too high, using the pump curve and hydraulic calculation. Do not label larger pipe diameter itself a fault or assume a variable-speed pump fixes a leak.
What does an assumed recording example look like?
Example only — assumed inputs, not measurements: water 28°C, air 22°C, relative humidity 60%, wind at the pool 3 m/s, uncovered duration 6 h/day and water-feature runtime 2 h/day. Assume an outdoor pool and one daily observation period. These figures demonstrate fields and units; they do not represent a project or predict savings.
For a real log, replace the assumed figures with timestamped readings and identify each instrument or controller record. Add the cover state, heating/pump runtime and energy-meter boundary. Without a measured baseline and comparable operating conditions, report the inputs only, not a savings percentage.
When should the record not be used as a savings estimate?
Different weather, bather use, setpoints and equipment schedules prevent a simple before/after comparison from establishing a cover’s effect. Meter readings need the same equipment boundary. No universal savings rate or chemical-drainage benefit is claimed here.
Keep leak checks, makeup-water readings and filter-cleaning events in a separate water log. EPA identifies evaporation, leakage and filter maintenance as water-use issues; a closed cover does not diagnose them. Domain history is background reading, not evidence for current performance.
Copyable energy-input log: units and sources
Scroll horizontally to see all columns →
| Input | Unit / definition | Data source | Value / timestamp |
|---|---|---|---|
| Climate and weather | Location, period; air °C and humidity % | Local weather station or site logger | ____ |
| Water temperature | °C; sensor location and setpoint | Water-temperature log | ____ |
| Uncovered duration | h/day; opening and closing timestamps | Cover controller or operator log | ____ |
| Wind at the pool | m/s; measurement location | Site sensor; identify any off-site proxy | ____ |
| Spa / water feature | On/off and runtime h/day; exposed area m² | Controller log and project drawing | ____ |
| Equipment and metering | Runtime h/day; electricity kWh; equipment boundary | Pump/heater log and energy meter | ____ |
Related hubs
- Automatic Pool Covers
Types, tracks, retrofit versus new-build, spa covers, safety, and energy for specifying an automatic pool cover.
- Pool and Spa Equipment
Pumps, heating, automation, and plant-room interfaces for residential and commercial pools.
- Pool and Spa Maintenance
Operations, cover care, and troubleshooting for owners and facility teams.
- In-Ground Spa Design
Outdoor built-in spa seating, depth, jets, heating, and insulation for pools and standalone spas.
Standards to verify
- EPA WaterSense at Work: Commercial Pool and Spa Equipment
Section 5.3, November 2023, EPA 832-F-23-003; evaporation and operation guidance. Accessed October 8, 2026. No published savings percentage is transferred to the assumed example.
- ENERGY STAR: Pool Pumps
Official pump-duty and heating guidance, accessed October 8, 2026. The journal does not prescribe a generic speed, runtime or savings rate.
- Equipment circuit and load record
Existing journal worksheet for the pump, heating and cover-state duties to attach to the log.
- Domain history and former resort identity
Historical context only; not current operating or energy-performance evidence.
Questions
- Why does this journal refuse a single energy-savings percentage?
- Climate, water temperature, wind, hours uncovered and equipment duty change the result. Keep those inputs and the measurement boundary with any percentage; this page does not supply a universal savings rate.
- Is solar pool heating in scope?
- Yes, as a heating option to assess against the site climate and operating schedule. It does not remove the need to record cover use, heat losses and the project’s heating duty.