The air is reused in a very steady loop, meaning the dryer doesn’t must be vented to the surface; this could cause further energy savings. HPWHs could be offered within a “unitary” tank configuration, much like common residential tank water heaters, and a “central program” configuration for multifamily and commercial  https://energy-brokers-48476874.hubspotpagebuilder.com/blog/energy-broker-vs.-direct-suppliers-understanding-the-key-differences