e-r-a-n:
i guess its one of the reasons for taking a higher current relay for the task?
if its drawing in practice around 15A and my relay is capable of 40A, wouldnt it heat less?
No, the actual heat dissipation for the package is independent of the maximum current rating for the SSR. It's just current actually being drawn X the 2 vac constant voltage drop across the internal Thyristor device (triac or back to back SCRs) doing the switching. So any SSR packages have at least two limiting specifications, maximum current load and maximum heat dissapation for the SSR/heatsink package.
Note that the old standard electromechanical relays have no such heat dissipation problems as the voltage drop across the closed contacts has little to no voltage drop, but they too have a maximum contact current rating that the contacts must met or exceed.
Lefty