Introduction to boiler enameling technology

Introduction

Hot water tanks, which are typically used for (solar) boilers and water heaters, may be manufactured from either stainless steel, copper or mild steel.

The selection of the appropriate substrate depends on many factors, such as the annual production volume, the average dimensions of the tanks, expected water quality, desired product life and raw material cost.

Due to the ongoing price increases of stainless steel & copper, there is nowadays a worldwide trend towards manufacturing hot water tanks from mild steel.

HWT’s made of mild steel need to be coated internally, either with zinc, powder coating, nylon or enamel to protect it against corrosion.

According to a publication by the CISP, in which the various corrosion protection methods were compared, porcelain enamel provide the best protection (read longest life) against corrosion by boiling water.
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