The Rheem STID Indirect Tank MAX models are part of Rheem’s stainless steel indirect water heater line, delivering a high-performance domestic hot water solution when paired with high-efficiency boilers. Available in 80- and 119-gallon capacities, these models are designed for larger homes and light commercial applications. Using a high-capacity heat exchanger coil, the STID 80 MAX model provides up to 70% greater first-hour delivery and up to nearly 90% more continuous hot water output than the standard STID 80 model, based on engineering specifications. The durable stainless-steel tank is backed by a lifetime limited warranty.