10-14 days is about normal for germination, so you should be seeing better results by now, especially with bottom heat. Chances are that the seed is not the problem. I have also had trouble germinating beans in pots, if using a sterile soil-less mix (which is what I recommend for beans). Beans require a little N to trigger their best germination rate, something absent from most peat-based mixes.

You can overcome this problem by watering with a weak nitrate solution, of 1 teaspoon of liquid fertilizer (such as MG, or an organic solution rich in N) per gallon of water. Because beans are very prone to rot, I recommend using boiled water, to further reduce the chances. Use this solution only once; either for your initial soaking (best) or shortly thereafter.

You can try this with the beans you have already planted, and a few may still come up. But I suspect that quite a few have already begun to rot, so after another week, you might want to replace any which have failed.

thank you, I have ordered another batch and will try your nitrate solution

I planted Jeminez beans direct sowing in the ground. They all sprouted.
First time trying these beans.