11
Hydronic and radiant heating systems, and related parts and accessories namely, propane, natural gas or oil fired boilers with expansion tanks, pumps, temperature sensors and injection mixing controls; water heaters for domestic and commercial use; propane, natural gas and oil fired boilers and related parts and accessories namely, expansion tanks, primary pumps, secondary pumps, temperature sensors and injection mixing controls; boilers which supply residential or commercial hot water; heating appliances namely, natural gas, propane and oil fired boilers connected to an under-slab or under floor distribution system or other radiant or space heating systems
40
Custom manufacture of heating systems and parts and components thereof; Custom manufacture of water heaters and heating appliances and parts and components thereof
42
Design of residential and commercial heating systems
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