Scooter36 Posted April 13, 2023 Report Share Posted April 13, 2023 Hi can anyone tell me what the tube with bolt in top is for, on my old calorifier, thanks. Link to comment Share on other sites More sharing options...
David Mack Posted April 13, 2023 Report Share Posted April 13, 2023 Immersion heater? Although it's not the standard fitting. Link to comment Share on other sites More sharing options...
Tracy D'arth Posted April 13, 2023 Report Share Posted April 13, 2023 2" immersion element. Still available. Link to comment Share on other sites More sharing options...
magnetman Posted April 13, 2023 Report Share Posted April 13, 2023 Maybe a 12v one like this ? https://www.ebay.co.uk/itm/354386232220 Link to comment Share on other sites More sharing options...
Scooter36 Posted April 13, 2023 Author Report Share Posted April 13, 2023 Its 1 1/2 inch, was hoping it was for a immersion, new calorifier, cost loads! Will look at 12v ones too, see if it will fit, Thanks Link to comment Share on other sites More sharing options...
Tony Brooks Posted April 13, 2023 Report Share Posted April 13, 2023 9 minutes ago, Scooter36 said: Its 1 1/2 inch, was hoping it was for a immersion, new calorifier, cost loads! Will look at 12v ones too, see if it will fit, Thanks Look up Essex Flange, that would allow you to cut a new hole and fit an immersion heater. Link to comment Share on other sites More sharing options...
Scooter36 Posted April 13, 2023 Author Report Share Posted April 13, 2023 Cheers, will do Link to comment Share on other sites More sharing options...
David Mack Posted April 13, 2023 Report Share Posted April 13, 2023 24 minutes ago, Scooter36 said: Its 1 1/2 inch, was hoping it was for a immersion, new calorifier, cost loads! Will look at 12v ones too, see if it will fit, Thanks It will most likely be a BSP pipe thread - the nominal bsp size is smaller than the thread. See https://en.m.wikipedia.org/wiki/British_Standard_Pipe for the detail. 37 minutes ago, magnetman said: Maybe a 12v one like this ? https://www.ebay.co.uk/itm/354386232220 That ad quotes different thread sizes in the text and pictures! Link to comment Share on other sites More sharing options...
Scooter36 Posted April 13, 2023 Author Report Share Posted April 13, 2023 got the cap off, internal size is 25mm, would be a very small immersion, if calorifier is the original, its 40 years old. Link to comment Share on other sites More sharing options...
David Mack Posted April 13, 2023 Report Share Posted April 13, 2023 (edited) Probably 3/4 bsp, which is too small for an immersion heater. Perhaps a secondary draw off for hot water for a shower. Edited April 13, 2023 by David Mack 1 Link to comment Share on other sites More sharing options...
Scooter36 Posted April 13, 2023 Author Report Share Posted April 13, 2023 Bugger, then a new calorifier, or Wallis heater, Thanks Link to comment Share on other sites More sharing options...
Tracy D'arth Posted April 13, 2023 Report Share Posted April 13, 2023 33 minutes ago, Scooter36 said: Bugger, then a new calorifier, or Wallis heater, Thanks No, cut around it and fit an Essex dome flange. This one is standard 2 1/4" BSP for a standard immersion element. https://www.bes.co.uk/2-1-4in-bsp-female-outlet-brass-domed-fixing-12267/ Link to comment Share on other sites More sharing options...
Scooter36 Posted April 13, 2023 Author Report Share Posted April 13, 2023 14 minutes ago, Tracy D'arth said: No, cut around it and fit an Essex dome flange. This one is standard 2 1/4" BSP for a standard immersion element. https://www.bes.co.uk/2-1-4in-bsp-female-outlet-brass-domed-fixing-12267/ Be worth a try, thanks sounds like a good challenge. Link to comment Share on other sites More sharing options...
Tracy D'arth Posted April 13, 2023 Report Share Posted April 13, 2023 18 minutes ago, Scooter36 said: Be worth a try, thanks sounds like a good challenge. They are easy, fitted hundreds. They come with instructions, worth reading carefully Link to comment Share on other sites More sharing options...
Scooter36 Posted April 13, 2023 Author Report Share Posted April 13, 2023 Will save a fortune, thanks Link to comment Share on other sites More sharing options...
ditchcrawler Posted April 13, 2023 Report Share Posted April 13, 2023 3 hours ago, Scooter36 said: Cheers, will do If the engine heats the calorifier as well make sure you get high temperature gaskets for the flange, the standard rubber ones go hard at those temperatures. Link to comment Share on other sites More sharing options...
magnetman Posted April 13, 2023 Report Share Posted April 13, 2023 2 hours ago, David Mack said: Probably 3/4 bsp, which is too small for an immersion heater. Worth investigating further before assuming https://gbr.grandado.com/products/dernord-sus304-120v-750w-electric-immersion-cartridge-heater-heating-element-with-1-2-npt-thread?variant=UHJvZHVjdFZhcmlhbnQ6ODI5OTM1OTg&gclid=EAIaIQobChMIwq2xmLin_gIV09_tCh0mGABEEAQYAiABEgIIO_D_BwE 1/2npt thread which is about 16mm. 750w heating element "cartidge type". I think there may be something which will go in there with a bit more digging for information. IF it is a NPT not a BSP maybe this is was for a furrin thing of some sort. This one The one I linked to earlier is also "Dernord" it seems they make an extensive range of stainless steel cartridge type immersion heaters. Link to comment Share on other sites More sharing options...
Tracy D'arth Posted April 13, 2023 Report Share Posted April 13, 2023 3 minutes ago, magnetman said: Worth investigating further before assuming https://gbr.grandado.com/products/dernord-sus304-120v-750w-electric-immersion-cartridge-heater-heating-element-with-1-2-npt-thread?variant=UHJvZHVjdFZhcmlhbnQ6ODI5OTM1OTg&gclid=EAIaIQobChMIwq2xmLin_gIV09_tCh0mGABEEAQYAiABEgIIO_D_BwE 1/2npt thread which is about 16mm. 750w heating element "cartidge type". I think there may be something which will go in there with a bit more digging for information. IF it is a NPT not a BSP maybe this is was for a furrin thing of some sort. This one I think that these slim elements lack a thermostat and a safety over heat cut-out. Very dangerous on a pressurised system such as in a boat to use without both these thermostats. 1 Link to comment Share on other sites More sharing options...
magnetman Posted April 13, 2023 Report Share Posted April 13, 2023 Maybe that is why it is no longer fitted. I assumed there would be a prv on there somewhere. I think with a DIY arrangement and a relaxed attitude it could work but you are right to point out this problem.. Thank you. Link to comment Share on other sites More sharing options...
adrianh Posted April 14, 2023 Report Share Posted April 14, 2023 Measure the outside diameter of the thread and the number of threads per inch to check the thread. It does look like 3/4 bsp though. You can buy stainless steel industrial heaters this size in various lengths, voltage and wattages but they do require a separate on/off temperature control system. I think that you could use a strap on pipe thermostat ( drayton, honeywell ? ) for this purpose on the upstand pipe for the heater. Alternative would be a capillary thermostat ( capillary with 2 straps to upstand and fully lagged ) safely mounted in an electrical enclosure box. In both cases check current ratings and wire with high temperature cabling etc. Ask if you want more info Link to comment Share on other sites More sharing options...
Scooter36 Posted April 14, 2023 Author Report Share Posted April 14, 2023 1 hour ago, adrianh said: Measure the outside diameter of the thread and the number of threads per inch to check the thread. It does look like 3/4 bsp though. You can buy stainless steel industrial heaters this size in various lengths, voltage and wattages but they do require a separate on/off temperature control system. I think that you could use a strap on pipe thermostat ( drayton, honeywell ? ) for this purpose on the upstand pipe for the heater. Alternative would be a capillary thermostat ( capillary with 2 straps to upstand and fully lagged ) safely mounted in an electrical enclosure box. In both cases check current ratings and wire with high temperature cabling etc. Ask if you want more info Thanks, will look in to that Link to comment Share on other sites More sharing options...
magnetman Posted April 14, 2023 Report Share Posted April 14, 2023 Maybe the fitting was added for one of these Or a thermostatic switch which automatically turned the engine off via a relay arrangement when water was up to correct temperature. Link to comment Share on other sites More sharing options...
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