The usual for silver soldering where you want to get the whole assembly upto temperature fairly quickly is Propane with a burner of around 7Kw. Although MAPP burns at a higher temp the torches are smaller so overall heat output is less.

The starter Sievert sets have the right size burner, mate with a 4bar regulator

You can do a bit of Sif brazing with a torch like that provided the section of the metal is not too great otherwise it won’t get hot enough.

For things like studs you probably want a more localised higher temp probably oxy propane but I’ll leave others who have the kit to advise

For things like stuck studs,  you might consider an induction heater as an alternative.

These are great for getting heat quickly into the target without unduly heating adjacent items.

Also no naked flame, so less fire risk.

Probably of limited use for silver soldering etc. especially as they are more effective on a ferrous target.

You probably know this already, Chris …

The Sievert ‘Cyclone’ burners are excellent.

MichaelG.

how about a carbon arc torch. cheap on evil bay, run mine off a 50 year buzz box welder

Instead of loosening stuck bolts by heating and expanding the surrounding area, freeze the bolt to shrink it using a refrigerant spray called FREEZE-OFF Super Penetrant.

Made by CRC Industries and sold at auto part stores.

See Youtube video  https://youtu.be/ULXahcy0CO0

I’ve mentioned is previously, but thus far haven’t had much feedback from others on this forum.
As well as a larger propane torch for a greater heat capacity, as apposed to a small high temperature job, I use oxy-propane for small hot flames.
I couldn’t justify the ongoing cost of bottle rental, though I know there are now rent free cylinders, so I went for a second hand medical oxygen concentrator, for about the came cost as a bottle deposit.
Mine came off Gumtree, for about £100, but other sources are available.
I use a small lead soldering torch, sometimes with specific oxy-propane nozzles, as well as a full size one.
Not enough oxygen for cutting, either in terms of volume or pressure, but fine for small heating jobs.
Glass bead makers often use this combo, so have a look at Tuffnell Glass for more ideas.

https://www.tuffnellglass.com/contents/en-uk/p3918.html

I’ve not got round to trying it yet, but also have a couple of large butane bottles from an old portable heater;
This link suggests that it might also be suitable for small precision jobs, in the summer or a warm workshop at least.
https://www.dentaltix.com/en/stag/oxy-butane-fgr-750-butane-and-oxygen-equipment

Bill

Have a look at Bullfinch torches, British made, full easy service and repair if needed,  I have used these for nearly 50 years now and find them excellent — only needed the repair service once, the ignition system failed on one unit.

https://bullfinch-gas.co.uk/blowtorches/autotorch-2300