KIASA - 2400W - Far Infrared Bar Heater - Radiant No Glare Heater- Wall or Ceiling Mount - IP44 rated [Energy Class A+]

I brought a 2400W heater for my garage that Kiasa say will heat an area up to 30m2. My garage is 15m2 and during the recent cold weather I used the heater for the first time and found that it has virtually no effect on the temperature! This was after having the heater on for 5hrs with the door shut!I complained to Kiasa and they apologized and suggested that I change the angle of the heater because that might work! It made no difference. I sent photos of the heater in my garage and the interior of the garage too. They responded by saying, "Looking at the images provided, I can see there are a lot of metal objects within the room, the infrared radiation will be absorbed by them first before you receive any heat, unless you are working directly within 2 meters of the radius." Surely every garage and workshop has a lot of metal objects in them?The heater is sold on the basis of being able to heat a workshop up to 30m2, (and even has a picture of one in a workshop in the images alongside this heater!), now Kiasa say that it's only really good for a 2m radius! I've emailed them several times and their is always a lengthy delay with no response. Until I prompt them again. Just recently they have been responding and they've said that I can return it to them at my own expense to test. They will do the test for free and if there is a fault they will return it for free but won't refund the £35 I'd have spent sending back to them!I have a suspicion that after sending it back they will stay there is nothing wrong with it and demand money to send it back to me, but if it isn't faulty then why would I want a rubbish heater back!I've said that I would like a refund and they said as the heater is over six mouths old they don't see why they should, implying that Kiasa think their heaters should only last that long.These heaters seem like a case of the Emperor's new clothes as in this new infra-red heating doesn't really work. Please avoid!

We are staying out til 10.30pm cos with this heater we are warm and snug. It has revolutionised the amount of time we spend outside