D1’s products are engineered to be the most energy efficient spas in the industry. In 1981, D1 Spas was the first company to manufacture a fully insulated spa. D1 hot tubs are insulated with urethane foam, which is used in commercial freezers, and come complete with insulated foam covers precision-fitted with linear heat-seal seams to prevent heat loss. Portable hot tubs account for less than 1 percent of the energy consumed in residential homes. In addition, D1 hot tubs and swim spas use up to 85% less energy than traditional in-ground pools.
D1 uses a substantial variety of recycled materials in its products and processes. Thermoformed sheet scrap is either recycled into new equipment boxes or sent to a recycler.
D1 first offered Envirotect in 2001. These skirts are made mostly from post-consumer recycled milk cartons called HDPE (for high-density polyethylene.) It’s environmentally stable, does not give off harmful fumes and is recommended by the Healthy Building Network, a national organization of green building professionals and environmental health activists. Envirotect is the most environmentally friendly skirting material available on the market.