Peter Parry has brought this to us :
They will work. Contrary to what some have said they have more than
sufficient output and temperature to melt solder on 15 or 22mm pipe -
I use one quite often for just this although the application is
rather unusual.

However - they are far from ideal for domestic plumbing jobs as they
take some time and have far too much heat spread with the risk of
damaging surrounding items, a blowlamp is much better.

I agree.

They work under ideal conditions - making bits of pipe up on the bench,
but for anything else use a gas blow lamp.

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Regards,
Harry (M1BYT) (L)
http://www.ukradioamateur.co.uk