Trane XR16 Series 4 Ton 16 SEER 48000 BTU 4TWR6048H1000A unit is an outdoor cost-efficient single stage split system heat pump for your commercial and home heating and air conditioning needs. This 4 Ton 4TWR6048H1000A unit has a 16 SEER rating which implies that the Heating system equipment is absolutely energy-efficient. Additionally, this 4 ton heat pump unit is designed to resists rust and corrosion. For that, its base is made of the weatherproof CMBP-G30 material. Also, this 4 Ton 4TWR6048H1000A XR16 heat pump unit has a DuraTuff base pan with Weatherguard fasteners to ensure corrosion can’t cause any problem.