Harvia Cilindro PC90ECilindro Half Series 9kW Sauna Heater Harvia Cilindro PC90E, a modern steel pillar style electric sauna heater, is engineered to power sauna rooms up to 494 cubic feet (CF). The Harvia Cilindro electric heater contains a massive amount of stones. Thanks to the grate like outer shell, each bather can adjust the nature of the steam: soft when throwing water onto the side of the heater and sharp when throwing water straight on top of the stone pillar.