Mountings on an outside wall

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You could put a substatntial hardwood mounting plate on the wall to spread the mounting load over a larger area and fix it to that . Or if you really wanted to do a good job, a steel plate, galvanised then drilled and tapped for the heater mounting bolts.

How heavy is it? Three 10mm through bolts sounds something of an overkill. If it's the 90 quid one reduced to 45 quid on their website I'd have expected a couple of brown wallplugs and screws to be adequate.

Don't bother with the one in the mortar, as you say it won't hold much. Two really good fixings into separate bricks will hold a huge load safely. Not sure what you mean by through bolts though?

I think people underestimate the strength of modern fixings. I put up a hanging basket for a lady the other day, apparently it had fall off a couple of times. Drilled new holes, used 2 - 6 x 60 multi montes & then hung my entire weight (not inconsiderable, I am a burly chap) on it. Its never coming down.

Can't remember who it was on here that put me on to multi montes, but thanks whoever it was.

Not me, certainly. What are they? Google just failed to find them (or perhaps I didn't recognise any of the links as the 'correct' ones)?

Correct speeling always helps ;-)

That depends on how well the elephant scarer is working, if he gets a couple of those perching on it it will need through bolts.

Actually, it's a pretty hefty thing, plus it stands out from the wall so could put a bit of torque on the mountings. I bought the 10mm bolts because I'd like to be able to mount it in such a way I can easily demount it in the winter (probably the summer too, judging by the rain this year!). Their studs fit the drillings in the bracket closely and it's easier to put a nut on and off, given the weight, than to try to use a screw.

Through bolts probably should have been spelt 'thrubolts' as on this page: