I don't think you need to worry too much about heat resistance.....rads are often just emulsion painted anyway when they get on a bit.
Either way, International Paints have what you need.
Are you doing yours black?
John
If you need to find a tradesperson to get your job done, please try our local search below,
or if you are doing it yourself you can find suppliers local to you.
Select the supplier or trade you require, enter your location to begin your search.
Please select a service and enter a location to continue...
Are you a trade or supplier? You can create your listing free at DIYnot Local