Guardrail for Globe heater HGL7. Harvia Guardrail HGL7 is a stylish way to add safety around the impressive 10.5-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 HGL7 is intended for Globe GL110 and Globe GL110E stoves. The diameter of the guard rail around the heater is 690 mm.