Heating Canister Design for Manufacture and Serviceability

This paper presents a case study on heating canister design with a particular emphasis on the design for manufacture and serviceability. Heating canisters are used in water heaters to heat up water instantly and are made of deep drawn copper sheets. The canister assembly process includes welding which is highly labor intensive and the quality of canister assembly depends on the process of capability. Any variation in this assembly process will result in losing of the completed canister which can not be recovered as it is fully welded. The purpose of this paper is to present an alternate modular design which reduces the reject rate during manufacture, increases serviceability during manufacture while addressing the issue of recyclability of the canister assembly during the usage. The proposed modular design also addresses the cost of rejection during the manufacturing process.