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Thanks mickyg - Sedbuk give the Ulimate 100FF a 77.5% efficiency rating so I guess the 120FF is around 78.5. The Ultracom 38HXI is rated at 90.8% and 'Which' rated it only slightly lower in their tests but made it a best buy. We use around 130,000kwh per annum and buy gas at a commercial rate...

Thanks for all the posts - all very informative but I thought I would try to clarify what my objectives were and also answer some questions raised and see if there is any consensus. We have a Gloworm Ultimate 120FF with 28mm flow and return reducing after the pump and cylinder branch. The...

Thanks for the very speedy replies. The spec for the HXI says it's suitable for sealed systems? Regarding output in the winter we run the Ultimate 120 almost 24/7 and have huge gas bills but I thought the greater efficiency of a condensing boiler may mean we could squeeze the same output from a...

I'm and architect and have a Gloworm Ultimate 120FF which has worked reasonably well for 9 years but I've had to replace the fan and the control board and now there is a problem with the electrode. It's a sealed system operating part radiator circuit and later installed underfloor heating...