i fill my tanks to 4500 every time, but i run it indoors in the ac with a fan on it and time it .. only run it 10 minutes then bleed it turn it off and let it cool for at least 20 ... the whole thing gets hot .. thats what most people miss .. including the manifold blocks where the orings and disk are ... no amount of giant water pumps, radiators, and ice does jaxk sht for those .. only that potato between your ears can help the situation lol ...