We moved into this house in 1990 when I was a nipper, it had a GloWorm spacesaver on a pumped CH/gravity DHW system. In 1998 we had issues with the pilot light going out on a regular basis so my parents had it looked at, engineers fixed the fault but said it wouldn't live another year......It lasted another 10 years when we had it and the cisterns/cylinder replaced with a combi for two reasons, one being the saving of energy and gas costs and the other being so we could have a shower installed without the need for a pump or a cable run all the way up from the cellar. Said combi is what you expert types on here call a 'Wooshitter' and has had numerous problems over the past ten years including leaking internal parts, dead fan and dead pump. In addition to that our gas supplier had a price hike within weeks of its installation, so much for saving money!