(36) Serpentine coil heaters offer lower cost per heating surface area. The design allows them to be installed in tanks with limited space. Bottom coils available. Hastelloy C and Zirconium coils available, consult factory. 1" diameter tubing with 1" MNPT fittings standard. 1/2", 5/8", 3/4" and 1 1/4" tubing available. PTFE sleeve for solution interface available.