Question for Heating/Plumbing knowledgeable members

macabethiel · 17-10-2017, 16:51

In the next week or so I am going to fit a new heating element in my water sylinder. The existing heater was new with the water cylinder 3 years ago so I do not expect any problems unscrewing the old element that is a short one mounted in the top of the water cylinder. I have the right tool to fit it.

When I replaced my last immersion heater some 25 year or so ago my tank was a Primatic one so I had to drain the whole heating system down. My new CH system is a fully pumped system with a motorised valve for the 3 heating options.

My question is this can I just switch off the hot water header tank, drain the hot water from the lowest tap in the house and remove the top mounted heater or do I have to use the bottom drain on the water cylinder and drain it completely as well?

17-10-2017, 16:51	#1
macabethiel Senior Member Join Date: Aug 2008 Location: Derby Vehicle: Freelander & Jeep GC 3.0 Posts: 4,416	Question for Heating/Plumbing knowledgeable members In the next week or so I am going to fit a new heating element in my water sylinder. The existing heater was new with the water cylinder 3 years ago so I do not expect any problems unscrewing the old element that is a short one mounted in the top of the water cylinder. I have the right tool to fit it. When I replaced my last immersion heater some 25 year or so ago my tank was a Primatic one so I had to drain the whole heating system down. My new CH system is a fully pumped system with a motorised valve for the 3 heating options. My question is this can I just switch off the hot water header tank, drain the hot water from the lowest tap in the house and remove the top mounted heater or do I have to use the bottom drain on the water cylinder and drain it completely as well?