Meh, not really sure how effective a hot or cold heat would matter when the head is traveling so fast for it to make long lasting contact.
The 40 pounds of pressure sounds questionable as well. You're not pounding a side of steak. I am a pretty fit 47 year old and I don't even turn my percussion massager up to it's highest setting.
This is what I purchased and have been very happy with it. https://www.amazon.com/gp/product/B081BD2D8T/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
ETA - Can I assume you want this for your back in some capacity as well. You would need this device if you want to use it solo and it would be incompatible with the B&B massager