If you check the list of Einstein@home applications, you will see that they support opencl-intel_gpu (and lots of other hardware). Every BOINC project has such a list of applications - with one glance, you can immediately assess project's computing capabilites.
Heat output is a often a good indication on how much computing is actually being done. Of course, laptops are usually cramped and thermally challenged and not really designed for intensive and continuous CPU and GPU workloads. Running it at 100 °C for prolonged period of time will shorten its lifespan. But even if you find out that BOINC is stressing your laptop too hard, you can still help Gridcoin just by running Gridcoin Wallet (it helps to secure the network). Also, holding Gridcoin in your Wallet pays an annual 1.5% interest compounded whenever you stake, even if you don't have BOINC installed at all (so called Proof-of-Stake mechanism).