The form below is the only way to reach Roomtherm. It sends the text you write and the address of the page you are on. We read every message but cannot answer them, because the form asks for no email address.
If a number looks wrong, copy the link from the calculator's address bar into your message. It carries the room size and the options you picked, so we can open exactly the result you saw. Say which figure you expected and where it came from: a unit's rating plate, an installer's estimate or another calculator.