# Orlushy 25W Submersible Aquarium Heater, 78°F Preset for 1–6 Gallons

Orlushy 25W submersible aquarium heater with a 78°F preset for small 1–6-gallon freshwater or saltwater tanks.

- [Original product page](https://www.ofertitastop.com/us/product/orlushy-25w-submersible-aquarium-heater-78)
- [View offer](https://www.ofertitastop.com/us/visit/orlushy-25w-submersible-aquarium-heater-78)
- Market: US
- Language: en-US
- Currency: USD
- Product updated: 2026-10-24T22:54:19.926Z
- Brand: Orlushy
- Model: 25W
- SKU: ofertitastop-us-128383
- Category: Animals & Pet Supplies > Pet Supplies > Fish Supplies > Aquarium Temperature Controllers
- Source store: amazon US
- Active deal: No
- Rating: 4 / 5
- Reviews: 2247

Prices and deal status are the latest recorded data, not a guarantee of availability. Confirm the price and availability with the store.

## Description

For a small betta tank that needs steady background heat, the Orlushy 25W heater offers a preset 78°F setting rather than a temperature dial. It is listed for aquariums from 1 to 6 gallons and for freshwater or saltwater use.

Its compact 4.7-inch length is intended to fit small tanks without taking up much room. The heater operates automatically when powered, switching between heating and standby as indicated by its red and green lights.

That makes it a different kind of choice from an adjustable heater: it favors a simple preset for a small setup, while an adjustable model is the more relevant direction when you need to set a specific temperature.

## Who it’s for

This heater is aimed at owners of small aquariums who want an automatic, preset option instead of manual temperature adjustment. It’s a great fit if your tank falls within the stated 1–6-gallon range and a nominal 78°F setting suits your setup. The product is specified for both freshwater and saltwater tanks.

The fixed setting is also the key trade-off. The stated temperature accuracy is ±3°F, and there is no adjustable temperature range listed for this model. If a particular fish or tank setup calls for a more closely controlled temperature, a heater with adjustable settings may be a better fit. The listed tank range is a guide to suitability, not a substitute for checking the needs of the animals in your aquarium.

## What stands out

The heater is designed to work without routine temperature selection: switch it on and it heats intermittently toward its preset. The red light indicates heating, the green light indicates that heating has stopped while the unit maintains its setting. This can simplify operation in a small aquarium, though the lights do not provide a numerical water-temperature display.

Its body uses a heat-resistant ABS outer shell, with a nickel-chromium heating wire and non-corrosive quartz glass. For placement, the instructions specify full submersion and vertical positioning in a fish tank. The product also describes horizontal placement for turtle tanks, but aquarium buyers should follow the fish-tank positioning guidance.

## Tech summary

- Type: Submersible aquarium heater
- Power: 25W
- Stated tank size: 1–6 gallons
- Preset temperature: 78°F
- Temperature accuracy: ±3°F
- Length: 4.7 inches
- Compatibility: Freshwater and saltwater tanks
- Materials: Heat-resistant ABS outer shell, nickel-chromium heating wire, and quartz glass
- Indicator lights: Red while heating, green when heating stops

## What to clarify

**Can the temperature be adjusted?** The supplied details describe a preset 78°F temperature and do not list an adjustment control or range.

**How should it be installed in an aquarium?** The heater should be fully submerged and placed vertically in a fish tank. Do not power it before it is underwater.

**What should I do before cleaning the tank or changing water?** Unplug the heater and let it cool for 10–20 minutes before removing it, as directed in the product instructions.

## Buying verdict

The Orlushy 25W is a straightforward option to consider for a small tank when its fixed 78°F setting and stated ±3°F accuracy suit your needs. Its compact size and automatic heating behavior are useful for a simple setup, but the lack of listed temperature adjustment matters if you need more control. It might not be a great match if your aquarium requires a temperature outside that preset or tighter temperature management.

## Images

![Orlushy 25W Submersible Aquarium Heater, 78°F Preset for 1–6 Gallons — 1](https://www.ofertitastop.com/i/pyM2kgNq00ibl9emVoGExi-itNqO55DPLUcaQ_HqVGO_F4cEQ-JOiELM-QeGBrxFy6HJqWmpwN8lmVGjk4xVqY0lquDQ6H517LcdwTWXspXjM1snVEpCVgf5RQ.jpg)

![Orlushy 25W Submersible Aquarium Heater, 78°F Preset for 1–6 Gallons — 2](https://www.ofertitastop.com/i/K9O10ZfSYHO8T-_D1k7OYRBcdzIXEr0_Zsfna9hIaS7cnM1heepUE-ftalUg3vJafQCIBUxw0XrS_Lt2V-C_pZCjs38xZK9p-DQ_JKDk2JmRgm1rJ_C6OyJgBw.jpg)

![Orlushy 25W Submersible Aquarium Heater, 78°F Preset for 1–6 Gallons — 3](https://www.ofertitastop.com/i/hTzdwr8KKYSL0BigkTy3Me46sxwR5l5KGTsQSmTIaqDYN1aS1kjFyQzyWZs167xIu7jDAN0SX6jNqeRnf-mgh5QPYaJG3ovz_u2ZGPZXVp0scwLkvSFzvNBouA.jpg)

![Orlushy 25W Submersible Aquarium Heater, 78°F Preset for 1–6 Gallons — 4](https://www.ofertitastop.com/i/BIrjPt8DL5VCz1X4nGkT1SOYNhEd1N-4bgpnmT6Nn9ewhvbYBuQl_6v_n8UaHX1vImEaXLE8QBFNuI9DM6kTobi8u60d3euthVhmVVmWPxahlJ5laRcvKXmX4w.jpg)

![Orlushy 25W Submersible Aquarium Heater, 78°F Preset for 1–6 Gallons — 5](https://www.ofertitastop.com/i/J3JBcArmHOK_3eWEwd1mWz8tCme663soHeb3qEuQ0YSRoQ4YHF35FAyrCWcMAU9odxzOwb3juBmeARSLUQpFYI85qY1eckwrhotsgP_MqAhS0FczP-OCFsSQ2g.jpg)