RM Optimum Heated Indirect Unvented Cylinder has created only to provide you with unbeatable facilities. It is designed with a new flat base for increased stability. It is the new and affordable range of RM Cylinders. It has been carefully developed and purpose-built to existing building and water standards. These cylinders are reliable for any standard boiler and operate using electricity to power the inbuilt 3kW immersion heaters. It has been created from many years of hard work and trying their level best to give their customers endless benefits with long-lasting preciseness. This unvented hot water cylinder is really a magical thing that beautifies your place to another level.