The HiDRA is the latest innovation in commercial water heating technology from Patterson Kelley. It is a heavy-duty instantaneous condensing water heater with up to 1000 MBH capacity, featuring a vertical firetube heat exchanger made from duplex stainless steel; a material renowned for its excellent durability and corrosion resistance. The largest HiDRA unit is capable of continuously producing up to 1128 gallons per hour of domestic hot water (100 °F rise), all without needing a storage tank or external recirculation pump! Its form factor is similar to that of a traditional 120-gallon tank-type water heater, making it a logical choice in both retrofit and new construction applications.

Due to the nature of the HiDRA’s design, owners will benefit from extremely high efficiencies year-round, even at DHW temperature setpoints as high as 180 °F. Unlike other instantaneous water heaters, the HiDRA has a “high mass” heat exchanger with internal circulation, ensuring excellent temperature stability (+/- 4 °F) under varying flow demand. As a testament to its durability, Patterson-Kelley backs the heat exchanger with a 15-year warranty.

For installations that are constrained by limited floor space, venting limitations, or higher water temperature requirements, the Modu-Fire and Thermific Velox are an easy solution at a budget-friendly price point. Both water heater models share the same vertical copper finned tube heat exchanger. The Modu-Fire uses a fully modulating burner with a 5:1 turndown ratio and near-condensing efficiency; requiring category IV stainless steel venting. The Velox variant modulates with a 2:1 turndown ratio and is approved as a category I appliance, with B-vent listed as an acceptable material. This means that in many retrofit scenarios, the existing stack can be re-used, which is a tremendous advantage. As a bonus, the Velox is still 85.0% efficient, making it eligible for a rebate ($3 per MBH) under FortisBC’s efficient water heater program! Both the Modu-Fire and Velox models feature the PK NURO control as standard.