Click to expand Tap to zoom PEWO VA-TFS-W1901 TFS System Hot Water (IDD35) by PEWO - ORIGINAL SPARE PART PEWO Heat Exchanger with Welded Thermostatic Head WATER (DHW) Use: IDD35 MPN: VA-TFS-W1901 Quantity Add to Cart This item is a recurring or deferred purchase. By continuing, I agree to the cancellation policy and authorize you to charge my payment method at the prices, frequency and dates listed on this page until my order is fulfilled or I cancel, if permitted.