calorifier

[Scooter36]

Hi can anyone tell me what the tube with bolt in top is for, on my old calorifier, thanks.

[David Mack]

Immersion heater?  Although it's not the standard fitting.

[Tracy D'arth]

2" immersion element.  Still available.

[magnetman]

Maybe a 12v one like this ? 

 

https://www.ebay.co.uk/itm/354386232220

 

[Scooter36]

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

[Tony Brooks]

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.

[Scooter36]

Cheers, will do

[David Mack]

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!

[Scooter36]

got the cap off, internal size is 25mm, would be a very small immersion,  if calorifier is the original,  its 40 years old.

[David Mack]

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

[Scooter36]

Bugger, then a new calorifier, or Wallis heater,

Thanks

[Tracy D'arth]

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/

[Scooter36]

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. 

[Tracy D'arth]

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

[Scooter36]

Will save a fortune,  thanks

[ditchcrawler]

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. 

[magnetman]

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. 

[Tracy D'arth]

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.

[magnetman]

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. 

[adrianh]

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

[Scooter36]

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

[magnetman]

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.