Stelrad ideal wlx RS50

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What's the general consensus on this boiler? We will be replacing this in the coming years as opposed to months - I'm just curious as to how inefficient it really is compared with a modern condensing boiler. From what I've been told it's nice and easy to service and built to last with virtually no complicated parts to worry about that are going to cost the earth.

I'll be switching to unvented from vented firstly and then hitting this unit afterwards as it will need outing eventually, as it's taking up kitchen wall space.

Any opinions?

Thanks

Tim