I want to compile a shortlist of suitable boilers to replace my 1987
Worcester Heatslave Highflow (23kW). The current installation is "Open Flue"
and gravity fed. The radiators are on a microbore circuit from a manifold
and have the Yorkshire Maxitwin valves - so Thermostatic valves can't be
readily fitted (I don't like them anyway)

The boiler is in an airing cupboard upstairs - and has a flue through the
roof - with 2 right angle bends. Vents from the loft space supply air to the
boiler. (The Gas Board service the boiler annually and are always critical
of the ventilation although it passes the tests)

I want a suitable combi that will be suitable for vent / flueing through the
roof. (Does the average gas fitter have the ability to get onto a roof to
install a new flue and deal with the flashing?).

I will be happy to convert to sealed primary to get rid of the loft tank.

The airing cupboard is not on an outside wall so condensate removal will be
a consideration.

Will I be able to get someone to change the boiler as I really don't want
the upheaval of replacing my system (yet) in order to fit new radiator
valves?

Any comments on what to aim for - what to avoid - how to just change the
boiler and not the whole system, etc.


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John