Please be sure when you are comparing BTU outputs you are comparing like for like. We display at Delta 50.
All reputable supplies adhere to BS EN 442 which specifies: flow =75C, return =65C, room =20C; i.e a delta of 50C.
If people are displaying at delta 60/65/70 they are inflating their outputs and trying to mislead you by making the product seem more powerful than it actually is. This could mean the radiator will not heat your room.
Unsure, try our handy BTU calculator
Please note that these product properties are not a replacement for the manufacturer's literature and it is always recommended that Apollo Radiators is consulted before specifying.