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Please can someone clarify: 1. Does the inlet tube actually get scaled up? 2. How can a cold water tube get scale build up on the inside? Is it due to the close proximity of the feed tube to the heater element? (see range tribune specification drawings at...

Thanks. I will look into this.

When you mentioned combi, I thought you meant a combination boiler. Did you mean this sort of a tank?....http://www.newarkcoppercylinder.co.uk/combination-cylinders--hot-and-cold-water-storage-cylinders.html

My first house, way back in 1970 had an integral hot/cold water tank. The cold tank was directly above the hot tank separated by a metal plate. The feed to the hot tank was just a hole through this metal floor. This was a vented set up. I dont know if there was an expansion pipe. You descaled it...

Out of the question. Too high a cost and no space.

How are you gonna avoid this eventuality then?

Once the inlet tube is scaled up, you have a big problem reaching it with a descaler. Regular descaling(whilst the tube still has freedom of flow) ought to ensure that descaler will reach the inside of the tube since it is not blocked.

Thanks. What I will do, is work out the volume of the cylinder from the bottom to the lower immersion and inject at least that much descaler. Repeat if necessary until the Fernox indicates no further treatment necessary (it does this by change of colour). I should think that would remove all...

Will do.

Thanks. The manufacturer does indeed recommend fitting one of these. I may consider it but first I would like to descale.

Thanks. I like to do preventative maintenance. My kettle gets really caked up so I imagine the heater is doing the same. One of the immersion heaters had the cutout operate and I suspect it may be suffering from scale build up and will keep on cutting out.

Once the cylinder is drained, I will use a fluid transfer pump to pump the descaler up the drain spigot. Alternatively pump the descaler up the 3/4 inch unused hot supply for the washing machine.I would like to plug in a pressure relief as an added safety feature. It will be plugged in where the...

Thanks. I dont think I am doing anything to the heater. All I am doing is draining it and introducing a descaler. Please explain what would be pointless? Do you mean plugging in a pressure relief valve? Surely it cant do any harm.

Thanks. I have not started yet. Been put off for the moment by comments about only persons certified to G3 may work on unvented systems.. I think I will have a go soon. It is only a matter of time before the scale will for sure cause a problem. Possible descalers are Fernox, white vinegar...

Thanks. It's in a flat, electrics only. Moved to a flat for a quiet life in me old age! Want to avoid problems in future.

Thanks. No problems so far. Just being cautious and trying to avoid any scale buildup giving a real problem in future. I have lived in a hard water are previously.

Thanks. Having lived in a hard water area previously, I just considered it prudent to have the boiler descaled before any scale build up causes a real problem.

Thanks. Does servicing include descaling? Just bought the flat. There is no record of servicing by previous owners. It was a repossession. System was installed in 2005.

Solved. No manual was found but the fitter installed it.