Which brand is better, casarte or Smith gas water heater?

As a key component of gas water heater, water tank has great influence on the performance of gas water heater. In general, under the same thickness, the thermal conductivity of copper is nearly 25 times that of stainless steel, with high thermal efficiency, which can effectively save gas for users. But the water tank of any good gas water heater on the market is generally copper. Casarte gas water heater insists on high-quality products, and its core component heat exchanger adopts high-purity oxygen-free copper, which has a longer service life than stainless steel heat exchanger.