Propex Printed Circuit Board 770.215 The Propex 770.215 is a replacement printed circuit board used in Pre-2018 Propex HS2000, HS2800, HS2000E heaters and Malaga 5 (Gas-Only) & Malaga 5E (Gas & Electric) heater models. If ordering this product, check the number on your heater's... MSRP: Was: Now: $215.95 Add to Cart