Heater with burner and heat transferrer has sand cast part of square or oblong cross section and projections formed in vertical offset positions on its inner wall

摘要

The heater has its heat transferrer in the form of a sand cast part (10) of square or oblong cross section with projections (14) in vertical alternating offset positions formed on its inner wall, forming channels (15, 16) angled in opposite directions. A protective cover (25) closes the combustion chamber (13) when the burner is removed for cleaning.