The unvented cylinder annual inspection myth?

Dec 02, 2008 Last reply: 7 years ago 114 Replies

I thought the header tank was simply left in place from an older installation or for another system in the same house. I've got a sealed system for central heating and hot water. There are still two header tanks in the loft above one bedroom and one of those is still in use, as the header tank for the woodburner with a back boiler.

Yes. Drayton Tanks do glass fibre ones, including ones rated at 100C. They cost an arm and a leg tho' You can probably still get galvanised steel ones if you look hard enough.

Bill Taylor coughed up some electrons that declared:

Ah yes - 100+ quid - I see your point(!)

:O

However if it is faulty you will be done for driving it even if its a week old.

Glass fibre Reinforced Polyurethane

Only a complete fool would write that.

Yes, zero if it is obtainable.

Which is totally irrelevant to domestic DHW production and storage.

Boy, you are confused.

You really have clue. Don't ever touch any plumber or gas equipment. Get real people to do that.

Don't confuse him any further!!!

You don't, you made that up.

You really have no clue how they work. Get yourself a how things work book.

What sort are you having, by the way?

;-)

I thought they were both storage tank collapse incidents. What caused the cylinder to rupture, do you know? Sounds almost as if it had gone unvented.

The recentish one certainly was. I am not sure the older report actually contained specific info - only "burst hot water cylinder".

Undersized vent scaling up, or inappropriate fitting of a gate valve in the wrong place would seem like obvious culprits though.

My God! I'd hate to see their leccy bill. My immersion was left on by a "guest" for a few days once and my bill increased by about 30% from normal.

If it is always on they do not notice an increase. The bulk of the energy to re-heat the cylidner will be from a powerful gas boiler with a 3kW immersion just assisting (expensivly so).

Or the amount of time people switch off the gas boiler in summer and use an immersion. They must like losing money.

That's what I said. Doh...

How does thermostatically controlled wood or coal burning stove work?

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