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Thorn or þorn (Þ, þ) is a letter in the Old English, Gothic, Old Norse, Old Swedish, and modern Icelandic alphabets, as well as Middle Scots and some dialects of Middle English. It was also used in medieval Scandinavia, but was later replaced with the digraph th, except in Iceland, where it survives. The letter originated from the rune ᚦ in the Elder Fuþark and was called thorn in the Anglo-Saxon and thorn or thurs in the Scandinavian rune poems. It is similar in appearance to the archaic Greek letter sho (ϸ), although the two are historically unrelated.
It is pronounced as either a voiceless dental fricative [θ] or its voiced counterpart [ð]. However, in modern Icelandic, it is pronounced as a laminal voiceless alveolar non-sibilant fricative [θ̠], similar to th as in the English word thick, or a (usually apical) voiced alveolar non-sibilant fricative [ð̠], similar to th as in the English word the. Modern Icelandic usage generally excludes the latter, which is instead represented with the letter eth ⟨Ð, ð⟩; however, [ð̠] may occur as an allophone of /θ̠/, and written ⟨þ⟩, when it appears in an unstressed pronoun or adverb after a voiced sound.In typography, the lowercase thorn character is unusual in that it has both an ascender and a descender (other examples are the lowercase Cyrillic ф, and, in some [especially italic] fonts, the Latin letters f and ſ [long s]).

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  1. R

    "High" stat temperature on Thorn Apollo 30/50B?

    Hi, Am trying to understand my mother's Apollo boiler. It has an intermittent fault. In the last couple of years, it has had a new thermocouple, a new "low" stat, and a new pump over-run switch. The RGI was not throwing parts at it, and the replacement of these has solved some problems: I...
  2. K

    Thorn 25/30 ah fan problem

    I have been asked this one by a customer and am not sure as it’s a old boiler I no nothing about how it’s meant to run. So the time clock packed up so I replaced it and all was well but now the customer is telling me that the fan runs all the time, even when the stat has cut the burner. Is...
  3. M

    Thorn emi fanfare boilers?

    can any of you knowledgable folks shed any light on the above mentioned boiler? I’ve never even heard of the brand. Im due to service one tomorrow so I’m trying to find a manual to no avail. Any info would be greatly appreciated.
  4. G

    Thorn Housewarmer S Gas Fire & Back Boiler

    Hi, I wondered if anyone could explain how the gas fire ignites and gets its gas supply on the Thorn Housewarmer S Back Boiler & Fire combination. I'm happy with lighting the back boiler pilot and firing it up, but not clear on the fire i.e. is it electric ignition or does it have its own pilot...
  5. A

    Thorn Olympic issues

    Hi I was called out to this boiler a few days ago. As soon as boiler came on all the power tripped in the house. Unwired the 3port and was ok. Replaced 3 port, turns out pump had seized also. Replaced pump. As the power was initially tripping I was unable to test anything else. Now, ch and...
  6. A

    Thorn Apollo, pilot will not light

    Hi everyone, Been to look at a Thorn Apollo tonight, 30/50b. The pilot will light if I hold in the gas valve button and press the ignition button but goes out as soon as the valve button is released, holding it in long enough but it doesn't want to know. Thermocouple looks ropey. Have tried...
  7. P

    Thorn Olympic F Boiler Questions

    My mum rents out the flat above hers. The hot water cylinder and radiators are heated by an old Thorn Olympic F boiler. It never goes wrong so she wants to keep it for now. Recently she had a Gas Safe engineer in to do the landlord cert. Everything passed, but he did mention that the the front...
  8. T

    Thorn Olympian

    I am working in a property installing a very nice wet room (very nice it is) she has a pre historic thorn Olympian on the wall, I have talked to her about a combi as as it's the much better option but she didn't really understand me. looking at the flame picture it does look a tad on the yellow...
  9. kozak1968

    Thorn manual

    Hi chaps, does anyone have a link for an instaĺlation and service manual for a Thorn M30/42C boiler g.c 41 789 44. I've been online and can only find the installation part and could do with the service part of the manual... Cheers.
  10. H

    Remove old Thorn M floor standing boiler from loft?

    Hi all, Bit of an odd one, we moved in to a place which has a WB combi boiler in the kitchen (fitted around 2010), but up in the loft there's an old Thorn M floor standing boiler. Can't quite make out exactly which model from the pics. Spoke to a gas safe plumber who said he'd never seen...
  11. R

    Thorn Heating Olympus 38/50B heating only to 18 degrees and cutting out

    The above boiler has been excellent for 25 years. Recently, the temperature in house started to decline. The recirculation pump has been changed, and a new Honeywell thermstat fitted. Boiler fires up when the room is below 16 degrees, but cuts out when 18 reached It keeps coming on throughout...
    • ronrocket
    • Thread
    • boiler central heating system cutting cutting out degrees engineer looking please plumber thorn
    • Replies: 3
    • Forum: Plumbing Jobs | The Job-board
  12. P

    APS for Thorn Apollo 65/80 Si

    Hi, Can anyone out there supply an APS for an old Thorn Apollo Fanfare 65/80 Si? It's actually branded Myson Heating Ltd, and the serial plate is 8703/473048, so I suspect it's pre-1990. Any offers? Thanks in advance.
  13. H

    Thorn apollo top socket placement ?

    Hi i have a old Thorn apollo 15/30b boiler. Sometimes the boiler cuts out and i need to re light it. I have noticed the top socket(little missile shaped cap) where the pilot light is, has gone rusty and the pilot light is all over the place so i will replace it. When i put the new one in which...
  14. G

    Thorn Apollo.......but which one?

    Hi guys I came across a thorn apollo today and it needs some parts but has no GC number or anything to identify it.All I can say is it is probably as old as me.How on earth do I find out what model it is. Any help would be appreciated.Thanks
  15. L

    thorn emi appollo boiler time clock

    My time clock has stopped working (in timer mode). I removed the clock and have found a blue wire not connected. There is a blue connected to 1 and a black connected to 2. I.ve had a look at the wiring diagram and am thinking this has come out of 5. I didn't want to connect it to 5 just in...
  16. B

    worcester heatslave highflow floor standing boiler

    as anyone got a pdf manual for the worcester heatslave highflow floor standing boiler . got to service one next wk thanks ant
    • buckley plumb
    • Thread
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    • Replies: 15
    • Forum: Plumbing Jobs | The Job-board
  17. M

    Conventional Gas Boiler firing all the time.

    I have a old Olympic / Thorn EMI conventional gas boiler that has been working ok but over the last few months I have noticed that it fires very frequently, as often as once every 10 - 15 minutes, all day and night, when it shouldn't be doing anything (i.e. central heating / hot water timer is...
    • markyb2
    • Thread
    • boiler button color conventional could firing gas gas boiler oil thorn time
    • Replies: 9
    • Forum: Plumbing Jobs | The Job-board
  18. T

    Thorn Microtimer to Drayton LP722 PROBLEM !!!!!!!!!!!!!

    Hi Replaced a LP722 programmer for my old Thorn microtimer fully pumped y plan system, getting hot water when requested, and heating when requested, but when both together, mid position valve stays on hot water. N and L terminals,OK leaving 1 3 4 diagram says 2 no connection 3 wires left...
  19. P

    thorn apollo timer needed

    hi chaps a customer of mine has just contacted me about the timer on their boiler. they say it's a thorn apollo and it needs a new timer they've sent me pics of the timer and the wiring diagram for it can anyone tell me if you can still get them i suppose not lol. can you replace with something...
  20. I

    thorn apollo boiler

    Our 26 year old thorn apollo boiler is still going, but in the interests of efficiency we are thing of replacing it, we have had a quote from B. G. almost 3k, that is to replace it with a conventional type condensing boiler,(worcester bosch) and a power flush, seems a lot over the top to me...
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