You may be able to find this manual online. It is also possible to call the company and request a new copy.
You can find the Royal Thermosolutions WS44 manual on the manufacturer's official website, typically in the support or resources section. Additionally, you may check online retailers or platforms like Amazon where the product is sold, as they sometimes provide manuals in the product details. If needed, contacting customer service directly can also help in obtaining the manual.
You can try searching for the manual on the manufacturer's website or contacting their customer support for assistance. Additionally, you may find a digital copy of the manual by searching online on websites that host user manuals and guides.