# Which electric essential oil diffusers have the largest water tanks? — Verified Specification Comparison

> All specification data verified from official manufacturer documentation.

Which electric essential oil diffusers have the largest water tanks?

## Products

### BlueHills BlueHills Premium 1000 ML Large XL Essential Oil Diffuser with Remote Humidifier - Dark Wood Grain - N6 (N6-1000ML)
```yaml
product: bluehills-bluehills-premium-1000-ml-large-xl-essential-oil-diffuser-with-remote-humidifier-dark-wood-grain-n6-n6-1000ml
brand: BlueHills
price_gbp: 31.04
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
timer: 1 hour, 3 hours, 6 hours or continuous
auto_off: Auto-Off Safety Switch that prevents overheating when water runs out
capacity: 1000
humidifier: Yes
```

- **Price:** £31.04 [^1]
- **Summary:** This BlueHills diffuser has a large 1000 ML water tank with remote control and ultrasonic mist, designed for continuous use or timed sessions. It includes humidifier functionality and an auto-off safety switch when the water runs low, plus LED mood lighting with multiple colors. It suits people who want a large-capacity diffuser that can run for long periods and also add moisture to a room.
- **Ideal For:** It has a 1000 ml tank, and the product description notes it can run overnight and longer, making it one of the larger-water-tank electric diffuser humidifier options.
- **Additional Sources:** [^1]

### Pure Guardian SPA325CA
```yaml
product: pure-guardian-spa325ca
brand: Pure Guardian
price_gbp: 48.94
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
timer: continuous or intermittent diffusing and 3 mist speeds
auto_off: shuts off when empty
capacity: 200
humidifier: ultrasonic humidifier technology disperses a cool, fine mist
```

- **Price:** £48.94 [^2]
- **Summary:** Pure Guardian SPA325CA is an ultrasonic cool-mist essential oil diffuser with a 200ml water reservoir and a Murano-style hand-dipped glass design. It uses ultrasonic technology (no heating element) to continuously diffuse essential oil aroma, with options for continuous or intermittent diffusing and 3 mist speeds, plus a night light. It is designed for longer run time thanks to the larger 200ml tank and automatically shuts off when empty.
- **Ideal For:** It suits people wanting the largest-water-tank electric essential oil diffusers because the SPA325CA's water reservoir is 200ml, larger than many 100ml-class aroma diffusers.
- **Additional Sources:** [^2]

---
## References & Sources
[^1]: bluehills.io, accessed 2026-06-25. https://bluehills.io/products/bluehills-premium-1000-ml-large-xl-essential-oil-diffuser-with-remote-aroma-h
[^2]: The Home Depot, accessed 2026-06-25. https://www.homedepot.com/p/Pure-Guardian-SPA325CA-Ultrasonic-Cool-Mist-Glass-Aromatherapy-Essential-Oil-Diffuser-SPA325CA/302048728