Boilers have come a long way since their original designs as a a simple oil burner heater with a coil to heat water. Today, the newer systems are cold start boilers. These boilers don’t run unless there is a demand for heat. At Marbledale Plumbing, we recommend the Biasi Boilers. Instead of the traditional single pass boiler, the Biasi’s are equipped with a three-pass boiler which means they have a low water content, making them extremely energy-efficient. Due to the three-pass design, heat is quickly supplied to your heating zones and hot water needs at a faster rate while using less fuel than traditional boilers. With the Biasi boilers, you can achieve a fuel savings of up to 40% over conventional single-pass boilers. The Biasi boilers are an affordable and very energy-efficient investment for your home.


  • Outputs from 67,000 to 257,000 BTU
  • Gas or oil burner compatible
  • Easy access swing door
  • No flue required; can be direct vented outdoors
  • Low water content boiler heats up faster with less fuel
  • Efficient 3-pass heat exchanger boiler design
  • GG20 cast-iron construction for superior heat retention and durability
  • ASME and ULC listed
  • 58 PSI cast-iron construction
  • Lifetime on the boiler block to the original purchase