Heatrae sadia 10l multipoint unvented electric boiler this was new unused out of the box as you can see from the pictures and has only been installed for 2 weeks it was installed to supply hot water for a shower and basin in our summer house and it. Parts, when they go out, can give signals a foul odor or unusual noise can be a sign that there is a problem with the unit excessive water leaking out or the unit not heating the air to the desired temperature are an.