Dear customer, we are sorry to bring you a bad purchasing experience. Our furnace has passed professional PSE certification. It is indeed because the bottom part of the heating tube does not generate heat. In order not to affect the life of the furnace, we have designed it like this. , but you said that you think there is a problem with the design of this product, which will lead to problems with the use of the stove. Sorry, We do not agree with this.