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lt;p>The Honeywell Cylinder Thermostat Strap-On 50-80&#8451; is supplied complete with mounting strap for rapid and easy installation, so draining of the system or tapping the cylinder is not necessary. The L641A1039 can be used with bare or pre-insulated cylinders, and installation is simple. A cost effective way to manage your water temperature at home.</p> If the valve is readily accessible then replacing it is not a particularly big job. You may be able to achieve this without draining down the system, by fitting rubber bungs in the cold feed and expansion pipes - at the header tank. Bungs for this specific purpose are usually available from plumber's merchants (and possibly B&Q). Provided that both open vent pipes have an airtight seal, you may only need to catch/mop-up a couple of cupfuls of water when you remove the motorised valve. Otherwise, you will need to drain the system down to a level below the motorised valve.