Hydraulic Tank Heaters: Protecting Your Systems in Cold Conditions

A hydraulic tank heater warms hydraulic oil inside the reservoir to keep viscosity under control in low temperatures. This helps improve flow, reduce strain on pumps and valves, and prevent common cold-weather issues such as pump cavitation, slow response, and premature wear.

What is a hydraulic tank heater?

A hydraulic tank heater is a heating device installed in or on a hydraulic reservoir to warm the hydraulic fluid. In cold conditions, oil thickens and becomes harder to pump. Heating reduces viscosity, helping the oil circulate properly and improving lubrication throughout the system.

Hydraulic tank heater installed on a reservoir for cold-weather hydraulic system protection

Why do hydraulic systems need heating?

Heating is primarily about protecting components and ensuring the system behaves predictably during start-up and operation. The main benefits include:

Viscosity reduction: Cold oil becomes thick, restricting flow and increasing pump load.
Improved performance: Correct oil temperature helps maintain lubrication and efficient power transfer.
Preventing pump cavitation: Warmer oil reduces the risk of vapour bubbles forming and collapsing in the pump.
Better cold start behaviour: Faster response and fewer faults during start-up in low temperatures.
Extended component lifespan: Less strain on pumps, valves, seals, and filters.

Tip

If your machine is slow to respond on cold mornings, or you’re seeing noisy pumps and foaming oil, a tank heater may help stabilise operation.

Which industries commonly utilise hydraulic tank heaters?

Tank heaters are commonly used anywhere hydraulic equipment must run reliably in cold environments or with frequent start/stop use:

Construction & heavy equipment: excavators, cranes, telehandlers and attachments.
Manufacturing: presses and machinery where stable cycle times matter.
Agriculture: tractors, harvesters and loaders operating in winter conditions.
Aerospace: hydraulic systems where temperature stability is safety-critical.
Marine: deck machinery and steering systems exposed to cold air and wind chill.

How do I choose the right hydraulic tank heater?

Selecting the right heater comes down to oil volume, target temperature, environment, and available electrical supply. Use the following checklist:

Determine heating requirement: match heater output to reservoir oil volume and ambient temperature.
Confirm fluid properties: ensure compatibility with your hydraulic oil type and operating range.
Check power requirements: verify voltage and installation constraints.

Sizing note

If you can share your tank capacity and typical ambient temperature range, Flowfit can help you select a suitable heater size and type.

What is the typical operating temperature for hydraulic fluids?

While many hydraulic systems operate broadly between 30°C and 80°C, many applications aim to maintain oil around 50°C to 60°C for efficient operation and consistent viscosity (always follow your system and oil manufacturer guidance).

Can hydraulic tank heaters be used in outdoor applications?

Yes—provided the heater and installation are suitable for the environment. Consider:

Weather resistance: choose heaters with suitable protection against moisture and corrosion.
Temperature extremes: ensure adequate heating capacity for your lowest expected ambient.
Power supply protection: weatherproof electrical connections and routing.
Regular maintenance: inspect more frequently due to exposure and vibration.