Doctor Drivel wrote:

Unvented yes. You don't need to fit one of those when a heat bank can
be DIYed, doesn't have the ability to take down the side of the house
and doesn't costs £60 to £100 a year in annual service charges. A heat
bank will give better performance than an unvented cylinder. Avoid
unvented cylinders.

I'm intrigued as to how an unvented ho****er cylinder of any persuasion
can "take down the side of the house"

Correct me if I'm wrong, but...

It's a cylinder full of water with no air in the equation, or what air
"may" have been in the cylinder would be rapidly dissolved into passing
water, so no air in the cylinder.
Therefore, a water vessel pressurised to 3 or 4 bar max ? yet prolly
rated and tested to twice or thrice that pressure i'd expect will, at
most, should the unlikely event ever happen, develop no more than a fine
spray. Certainly not develop a wall-demolishing rupture!

I fail to see how an unvented hotweater tank is more of a hazard than
any pipe or joint anywhere on the domestic side of the mains stopcock.

As for an annual service of £100 pounds, that would be like saying if
you don't get your boiler serviced anually you'll die of gas poisoning.

Can you give justification for your scaremongering ?

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