I need to replace the washer on my hot water tap in the utility room.
The pipe does not have an isolation valve fitted.
My hot water supply comes from copper cylinder which is in the airing cupboard in my bathroom. Cylinder is fed by plastic cold water tank in the loft.
Do I need to drain the copper cylinder? How will I stop water from loft tank feeding it?
Is it safe to drain either the copper cylinder or the loft one?
Is there an easier way than draining?