Natural gas water boiler sealed combustion direct vented (Draft Induced). CGT model has built in tankless coil for domestic hot water.

W/M CONVERSION KIT FOR CGT-5 NATURAL - PROPANE Item #: 510811925 Your Price:  $161.00	WEIL MCLAIN CGs-3 GAS BOILER 67,000 BTU'S Item #: WMCGS3 Your Price:  $1,971.48	WEIL MCLAIN CGS-4 GAS BOILER 100,000 BTU'S Item #: WMCGS4 Your Price:  $2,089.08
WEIL MCLAIN CGS-4E 85% GAS BOILER 90,000 BTU'S Item #: WMCGS4E Your Price:  $2,215.08	WEIL MCLAIN CGS-5 GAS BOILER 133,000 BTU'S Item #: WMCGS5 Your Price:  $2,293.20	WEIL MCLAIN CGt-5-PIN GAS BOILER 133,000 BTU'S Item #: WMCGT5PIN Your Price:  $2,540.16