Bosch 90 Day Money Back Guarantee.Switch to a Bosch heat pump tumble dryer and trial it with the Bosch 90-day money back guarantee.To claim under the Promotion, customers must email: money.back@bshg.com with proof of purchase and providing the Promotion Products serial number, model code, purchase, and delivery dates within 90 days of purchase. Bosch Customer support will issue a unique reference number (URN) by email. The customer must then visit the Retailer from whom the Promotion Product was purchased and provide the URN Reference Number within 14 days of receiving your reference number and arrange the return of the product.