In 2011 a beautiful Spa complex in Northern Estonia switched from oil heating to pellet heating. We installed there PV1000 and PV500 burners with Viessmann Vitoplex boilers. For boilers, doors were redesigned and an ash removal system was developed to adapt the pellet heating. Both burners are now replaced with newer models (PV1000 in 2022 and PV500 in 2023). This boiler house has also a 1MW back-up boiler with oil.