Clean water is water that is safe for human use or consumption. Of course, this is important for the food and beverage industry and for domestic use, such as drinking water. It is also a necessity for many industrial applications.

Heating clean water presents its own challenges. The heater must provide heat without adding contaminants and must meet specific temperature requirements. To this end,  electric in-line heaters  are ideal for clean water applications.

Electric heaters are excellent clean water heaters due to their precision and efficiency. Inline heaters are the ideal option as they provide indirect heat. They heat a fluid that circulates through the heater and parallel to the target medium. This makes it possible to obtain a constant and precise temperature. 

Since this type of water heater is not in direct contact with water, it prevents any potential contamination. In contrast,  immersion heaters  can pollute water due to the same direct heating method that makes them so efficient. In-line heaters are therefore ideal for clean water applications.

Industrial applications of clean water heating

Industrial washing

In general, industrial washing applications require a large power supply. The water should be clean and of a high enough temperature to allow adequate cleaning. Industrial washing machines are frequently used to clean uniforms which may have stubborn stains from oil and other contaminants.

These systems remove metal deposits, particles and other debris in parts washing applications. They thus prevent damage, contamination and other problems from occurring when using the washed parts. 

The food industry uses in-line heaters in industrial washing processes that ensure product safety for human use and consumption. For example, ensure that bottles are clean and safe before filling them with soda or other products.

Industrial cleaning

While industrial laundry products are usually for consumers or humans, industrial cleaning focuses more on facilities. However, in both cases, important human and environmental safety considerations must be taken into account.

Industrial cleaning helps keep facilities clean and in good working order. But it also serves to eliminate dangerous spills and other risk factors. To mitigate these risks, it is necessary to carefully maintain water temperature and quality.

Frost protection

Freeze protection is required for applications located in or exposed to cold environments. Freezing can slow or stop processes, damage products, and even cause equipment failure. Preventing  liquids from freezing usually requires the use of electric heaters and possibly the application of chemical solutions.

If the water is not clean, debris and contaminants can make freezing prevention calculations inaccurate. Some parts of the water can freeze at different speeds and temperatures. In addition, it reduces the accuracy of the calculation of the dose of chemical solution. 


Fig. 1: engineering toolbox

Figure 1 shows a calculation determining the amount of ethanol for an antifreeze solution with clean water. By ensuring the water is clean, calculations remain accurate and the risk of freezing or ignition is reduced.

Heater Materials

Minimizing potential contaminants is extremely important for clean water heaters. This is why the materials and components of in-line heaters must be selected carefully for their specific application.

sheath and flange

Heater sheath and flange materials are always a consideration. The selection process should consider the corrosivity of the target fluid, the operating temperature, and the end use of the heated fluid.

For frost protection, for example, a copper sheath and a steel flange are usually sufficient. This prevents corrosion damage and withstands the necessary temperatures without degrading. For steam generation, the combination of a copper sheath and a steel flange is usually sufficient for washing and cleaning. However, the requirement may change if pure steam is required.

For food wash applications, additional protection may be required. A common approach is to use an Incoloy sheath and a stainless steel flange.


A pump is always required for an inline heater. It is responsible for transporting the fluid inside the heating system. In combination with heat, it ensures efficient flow rates.

Drain valve

A drain valve must be installed in any in-line heating system. It allows easy release of fluids to clear blockages, manage flow and facilitate maintenance. This is important for maintenance processes such as  high-speed draining of circulation heaters .

Quote for clean water heaters online

Wattco custom manufactures clean water heaters for industrial applications. Our engineering team carefully selects and configures our in-line electric heaters to handle each project’s flow, mounting, and power/area requirements.

Contact Wattco now for  online electric heater quotes  and information.