The Honeywell Home Two-Port Zone Valve 28mm is a compact corded electric storage tank water heater designed for indoor use. With a silver colour and a sleek design, this boiler with a side water connection location boasts an A energy efficiency rating. The valve is compatible with smart homes and comes with a manufacturer warranty of 1 year, making it a reliable choice for heating systems. Made with metal tank lining material, this two-port zone valve is a top choice for those looking to upgrade their heating system.