The VT200 'Classic' TRV is top of its class for design, performance, quality and reliability. Its classical looks and unobtrusive design make it suitable for any heating installation. An integral radiator balancing insert retains the radiator balancing setting when the TRV and lockshield valves are closed for cleaning, decorating etc. According to Building Regulations Part L1 thermostatic radiator valves should be fitted on "all radiators except in rooms with a room thermostat" to satisfy either Minimum or Best Practice installations. The valve can be mounted vertically or horizontally at either end of a radiator. To work correctly, the VT200 should be installed to a two pipe heating system and also have a free flow of air around the head to sense temperature.