Is it true that a low percentage (15%) of the energy delivered by electricity is absorbed as heat in the boiler?

The statement that a low percentage (15%) of the energy delivered by electricity is absorbed as heat in the boiler is indeed false. In most boiler systems, a significantly higher percentage of the energy is absorbed as heat during the conversion of electrical energy into thermal energy.

Boilers are designed to maximize heat transfer efficiency, allowing a much larger proportion of the energy input to be converted into useful heat for steam or hot water generation. In well-designed systems, thermal efficiencies can often exceed 85%, meaning that the majority of energy used is effectively turned into heat, not just a small fraction.

The efficiency can vary depending on several factors, such as the boiler design, the heat transfer methods used, and the operating conditions. While certain types of boilers may have lower efficiencies, the statement that only 15% of the energy is absorbed does not accurately reflect the general performance of boiler systems.