When you’re running a large‑scale AdBlue setup in cold conditions, keeping the system above freezing isn’t just a nice‑to‑have, it’s important for uptime and compliance. In this case, the system includes a 20,000‑litre AdBlue tank with 200 metres of internal pipework, heated by circulating hot water. That hot water is stored in a 140‑litre buffer tank, where an immersion heater with electronic temperature control is needed to hold the water at roughly 60°C. Maintaining this temperature ensures the AdBlue stays fluid and prevents crystallisation, which can otherwise cause blockages, pump failures, and costly downtime. Material selection is another important factor. Immersion heaters for water‑based systems are commonly built using stainless steel or Incoloy sheaths, which offer strong corrosion resistance and long service life in industrial environments.
To work out which immersion heater suits this setup, you need to consider volume, temperature rise, heat loss, and heating time. Our experience shows that immersion heater sizing is based on the formula: Wattage = (Volume × Temperature rise × 4.178) ÷ Time. This method is widely used to determine the correct heater capacity for both domestic and industrial tanks, ensuring efficient heating and preventing premature equipment wear. For a 140‑litre tank that must hold steady at 60°C, most systems fall into the 3 kW to 6 kW range, though higher outputs may be required if the tank is exposed to low ambient temperatures or if rapid heat‑up times are needed. Industrial tanks often require 6–12 kW or more, depending on insulation quality and operating conditions.
When it comes to physical dimensions, immersion heaters are available in a wide range of lengths and mounting styles. Standard industrial heaters can be installed via screw‑plug, flanged, or over‑the‑side configurations, depending on tank geometry and access points. Given most tank’s internal dimensions a top‑entry heater with electronic control is usually the most practical choice. These units offer precise temperature regulation, easy installation, and straightforward maintenance, making them ideal for systems where stable heat is needed. For AdBlue‑specific applications, Backer Wilson also offer purpose‑built tank heaters with adjustable temperature controllers and custom immersion lengths, designed to maintain stable temperatures and prevent crystallisation. This means you can specify the immersion depth, power rating, and control range to match your exact system requirements.
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