A:Answer Hi JohnF, thanks for your question and interest in Bosch! Our 800 Series (model WTG865H4UC) is a condenser dryer, and our 500 Series (model WTW87NH1UC) is a heat pump dryer. The differences between heat pump and condensate dryer types are as follows: Heat Pump – no heating element, no need to clean the condenser (self-cleaning), cycle time takes a few minutes longer than condensate; Condensate – 2,520 watt heating element, condenser needs to be cleaned (remove and rinse condenser periodically), slightly shorter cycle than heat pump. Bosch Dryers are supplied with an adapter (part#WTZPA20UC ) to fit a standard 4-Prong, 30A, Dryer receptacle (NEMA 14-30R) to power both Bosch Washers and Dryers. We hope this information helps. If you have additional product inquiries, please connect with our customer care team at 800-944-2904 for real-time support. Thank you!