Zip Aquapoint - This unvented water heater range comes in a variety of capacities and offers over-sink or under-sink installation. Suitable for single or multiple outlets, Aquapoint 3 is glass lined and features external temperature control and frost protection. Glass lined steel inner container: Tested to 13 bar, Insulation: High performance foam, Sacrificial anode: For protection against corrosion, External temperature control: Can be replaced without draining. Approvals: WRAS approval and CE endorsed.