This Triangle Tube Prestige Solo 399,000 Btu wall hung boiler melts 3,000 sq ft of driveway, courtyard, sidewalk, steps, and dog run at a Castle Rock home. The system as controlled automatically with a Tekmar #665 snow and ice-melt control with a 090 slab sensor. The 3/4” Europex Oxy Pex tubing is installed over 1” Dow Rigid Board Insulation (R-5).