Fireplaces come in various formats, sizes, and types, including freestanding and built-in models, with real or simulated fires. But they all share one thing in common: simply watching them creates a sense of relaxation for visitors. A wellness/spa fireplace can be fueled with gas, wood, or liquid fuels. The heat generated quickly warms the room, often eliminating the need for a separate heating system. In rare cases, the waste heat is even used to heat other adjacent areas, for example..