Herms coil connections

Hi, I am starting to plan my herms coil and I intend to use a 20m roll of 10mm copper. I am pretty confident in the coiling part but I am a bit confused as the best way to connect it to my HLT, I was thinking of drilling holes just big enough to take the 10mm side of a 10-15mm brass coupler. My issue is how am I then to go about creating a seal that leaves enough of the thread for the 10mm compression fitting to be secured to the coil?
Any help with this or maybe ideas on a better way to go about it would be brill!
Thanks
Brett

we use silicone hose to connect the herms up to everything. If you want a permanent connection you could use a 10mm tank connector and just drill the middle out

I just tried my local plumbers merchant and they don't stock 10mm tank connectors, google and ebay did not help much either

our local does its called danbys plumbing maybe search online for them
if that fails try a 10mm straight compression coupler packed either side with shower head washers

thats a pic of one of the couplers on our herms pot and its watertight

fwiw i played with a herms coil a little, and found a 2m length of 10mm copper tube ample length for liquor to heat upto the bath temperature, so 20m may be a little excessive..

if a 10mm tank connector proves tricky to source use 15mm and a 10-15mm end feed adaptor.
a quick rasp with a file or buzz with a 10mm drill bit will remove the pipestop from the 10-15mm adaptor allowing you to feed tube all the way through

Thanks for the advice chaps, I actually have 10m of copper not 20m so hopefully should be ok.

Am just building a HERMS pot based on new urn () with 10m of 10mm copper that I've coiled nicely around my large gas bottle,and found these connectors () which help it to connect to 1/2" fittings.
My plan is to not modify the urn at all - the copper coil will sit in there, and it will be controlled by a PID sensing the temperature on the outflow of the coil. Still sourcing bits though - getting more expensive due to wanting to connect in the BK as well as the MT so I can fill the urn with cold water and use it to chill and whirlpool...

they are what we have in the herms pot

You don't need 10 meters for a HERMS coil!!!!!! 2metres is more than adequate, indeed even that may well be too long

dead space within a herms coil can be pushed through with a litre of water, it may mix a little at the wort/water interface but should enable you to retrieve 90% of the precouse liquor.

you may be able to just blow it thru too ?? depends on the plumbing .. its pre boil so the odd mouth born yeast wont be a problem..


as mentioned above tho for 100% heat exchange between an ambient bath and the liqour in the submerged coil will be performed in the first meter or 2 of tube so the rest is totally redundant.

[angelhomebrew]

I bought some SS fittings specifically for our 1/2" tube HERMS coils which are a bulkhead fitting with 1/2" BSP male thread on one side and a compression fitting on the other

Probably shouldn't post a link

Anyway, just had a thought which may open up some options and make more fittings available. You can get reducing sets for the compression end of a fitting which changes what size tube the compression fitting can work with

Google or search on eBay for "reducing set" and may provide some more options

I suggest the reducing kits for fitting your 10mm pipe into a 1/2" fitting as they are more available than a 10mm bulkhead. I have a HERMS set up myself but I use a separate HERMS pot with 12 mm stainless steel as my coil. All my liquor water first passes through it on the way to the MT. when Mash recirculating is over and I start transfer to the boil kettle my sparge water is passed through the HERMS pot again to flush remaining wort and help clean the HERMS coil at the same time. Get great clear wort.