Energy Upgrades for Iconic Seattle Hotel

by Patrick Kinney, EIT

Revival of a Classic

The Roosevelt Hotel has been a Seattle icon for nearly a century – welcoming guests from all over the world. Through the years, the mechanical room has seen its share of power and heat sources – wood, coal, and electricity. Fast forward to today and The Roosevelt Hotel has connected to a reliable energy efficient steam source thanks to Enwave-Seattle and University Mechanical Contractors.

Roosevelt Hotel Seattle

The Challenge

Roosevelt Hotel had identified concerns within the building that needed to be addressed immediately. Domestic water for the upper floor levels (10-20) were experiencing low-pressure problems, and the thermal hot water mixing valve was leaking. In addition to these issues, electric water heaters running independently of each other were proving to be extremely inefficient and costly for the hotel.

The Solution

Enwave-Seattle kicked off the project by providing an underground connecting steam line to the Roosevelt Hotel. UMC routed the line into the mechanical space and continued the energy upgrades inside the mechanical room. By eliminating the existing electric domestic hot water heaters, the entire mechanical room was redesigned and upgraded.

Roosevelt Hotel Seattle

The Roosevelt Hotel’s existing electric water heaters were divided into the high and low-rise sections of the hotel with three heaters serving each. Each set of electric water heaters were independent of each other and were very inefficient. UMC connected both systems together and provided new domestic hot water booster pumps to serve the high-rise portion.

An Energy Transfer Station component, designed and installed by UMC, contains two doubled walled shell and tube heat exchangers, a brazed plate heat exchanger, and additional equipment to cool the steam condensate. The condensate is looped through the brazed plate and preheated the incoming domestic cold water, and also pumped out of the 500-gallon storage tank for other uses (e.g. laundry). The system averages 94% efficiency.*

If you want to learn more about UMC Energy & Environment and the services we provide, please contact

*Steam energy in from Enwave-Seattle to lost energy of condensate down the drain.