Grey hydrollator 4 pack from very effective for moist heat therapy application. It helps in improving blood circulation. With 1250Wt power input, it is easy to use and highly effective.The key aspects of heat therapy within an overall Physiotherapy treatment are: Heat can improve the flexibility of your tendons and ligaments. Heat will reduce muscle spasms. Heat may alleviate pain (heat may induce the release of endorphins, powerful opiate-like chemicals which block pain transmission