Guardrail for Globe heater HGL6. Harvia Guardrail HGL6 is a stylish way to add safety around the impressive 6.9-kilowatt Harvia Globe stove. The wooden guardrail around the heater is made of heat-treated aspen, which also creates a touchable design atmosphere in the sauna interior. Harvia HGL6 is intended for Globe GL70 and Globe GL70E stoves. The diameter of the guard rail around the ball heater is 600 mm.