Known for being one of Worcester Bosch’s most popular oil combi boilers, the Greenstar Heatslave II is a floor standing appliance that measures 855mm (H) x 520mm (W) x 600mm (D).

It’s suitable for kitchen or utility room installation and will fit neatly underneath your worktop between your cabinets and electrical goods. This boiler can be purchased with an output of 18kW, 25kW or 32kW and maximum flow rates of 15, 18 or 22 litres per minute respectively.

Since this model comes in three sizes, there is a solution available for small, medium and large-sized homes with one or two bathrooms. You will need to spend between £2,256 and £2,520 on the Greenstar Heatslave II, which includes a standard 2-year manufacturer warranty.

Boiler Energy Efficiency Credentials

The Greenstar Heatslave II has a SEDBUK efficiency rating of 90% and is A rated for heat and B rated for water. It is designed to provide high levels of efficiency and works with water heated by green sources including solar energy and wood-fired boilers for maximum efficiency. The boiler features an energy-saving ECO mode that alters the cycling function of the burner to allow it to cool more before reheating to your desired temperature. This floor standing appliance can also be used with various optional Worcester controls such as a programmable room thermostat to increase both efficiency and your comfort levels.

Greenstar Heatslave II Technology and Main Advantages

This model features built-in frost protection to protect the boiler when installed in cold areas, as well as a primary heat exchanger with one-piece baffle for quick and simple servicing and maintenance. It is supplied with 80/125mm room sealed flues with lengths of up to 8m, along with plume management of up to 5m.

The Greenstar Heatslave II is a great combi boiler option for families with small children because its user controls are concealed in a drawer. It also offers precise heating and hot water control and has a position for an optional programmer so that you can set specific times for your central heating to switch on and off throughout the week.

A ‘keep hot’ facility and an inbuilt thermal store are included so that you always have instant access to hot water and for prolonged periods. Not forgetting the ECO mode, which is an energy-saving function that ensures the burner fires less frequently between demands and maintains the heat store temperature at a lower level while making sure your hot water set point stays the same.

Is the Greenstar Heatslave II the Right Boiler Type and Size for Your Home?

Worcester Bosch’s Greenstar Heatslave II is suitable for small, medium and large properties, and the output level you choose will depend on the size of your home, your household’s requirements and how many bathrooms you have. It’s also a great solution for homes with limited space because there is no need to install a cold water tank or hot water cylinder. However, this information should be used as a rough guide, and you must ask a qualified engineer to assess your heating and hot water needs before shopping around for a new boiler to ensure you pick the right model.