As suggested elsewhere, it can be useful to have a place to document how your house works and how to look after it, so that you can pass information onto future owners, or your significant others if you pop your clogs and are the guardian of lots of hard won information!
That's all very well for a newish house. Old houses can be far more characterful, and can go well beyond just the many quirks and oddities in diy stuff. Eg where are the bodies buried.
This is a great idea. Could I please make three suggestions under the "water" heading? I don't think I can edit the wiki.
These are all from my flat - built c 1990 - which I moved into four years ago, though they were probably all added c ten years ago when the property was replumbed. I had not seen any of these on any previous property I lived in.
Cold water pressure regulator, on main incomer. Just the location.
Details of bathroom sink mixer tap cartridge. This began to leak last autumn. I thought I'd be able to get a replacement off the shelf from one of the many local plumbing merchants. Not so. Had to get details (by dismantling) and get in touch with the manufacturer, who posted one out very quickly.
Hot water pump. Sits on floor beneath immersion heater tank. Operates automatically when a hot tap is turned on. Gives great showers! but if it fails there will be no hot water.
Details of the path taken by the sewer pipe run, if known for certain/determined by dyed water releases timed at various inspection hatches etc, to avoid planting trees over it, and any blockage problems in the future useful to know
During the lockdown, we were tasked with helping someone via the phone that used to be very reliant on the (now gone) husband solely operating the TV for her.
But saying that, lots of enthusiast AV gear can be quite complicated with "hard won" workarounds to select different sources. And alarms, cars, telephones, heating clocks and switches are just as bad.
If ye are tasked and able, get them trained now - and accept their training likewise: cooking, ironing, washing, cleaning.
Then there is the rabbit hole of IT.
Critical on-line accounts, and particulars of the connection itself.
Location of water isolation valves (when X springs a leak, need to know where the isolation valve is upstream of it - especially if there isn't one fitted to every tap)
Username/password for any 'smart' tech Possibly settings dump for 'smart' things, in case you need to reset them after forgetting the above / re-pairing with different phone /etc
Location of buried services in the garden (not just drainage but phone cable, power run to the fountain, etc)
Design codes and suppliers for any items which might need to be re-ordered at a later date, whose source isn't obvious (paint codes, wallpaper designs, frosted glass designs, blinds, windows, bricks, etc etc)
What I have done for years is to copy and laminate the instruction manual for various things and leave them close to the items such as the adjustment instructions for the CH pump, cleaning instructions for the magnetic filter, connections to my video distribution loft box etc.
The future ain't what it used to be. As a young man I expected by now houses that just know when you need the lights on and when not, without the need for orders.
And you can use the PDF's word/phrase search facility to find what you want without having to trawl through pages of irrelevant guff.
I even scan manuals where there's no online version and add the scans to the manuals folder. At least I can find it easily even if I can't search through it (I suppose I could OCR the scan, but fixing the errors takes more time than it's worth).
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