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I am in a modern flat, so very well insulated but my hot water is via a ASHP, room heating via convection heaters. The ASHP has been in 8 years and seems to of been problem free but it is pretty big compared to a boiler given that it only does hot water so needs an airing cupboard or loft to have the tank in that it is heating and obviously it isn't very responsive, so like growing up before combi boilers, if you all have showers and use the up the hot water, you are bang out of luck, it does have an immersion element you can flick on for an hour for such situations. I almost never have that issue as it is only two of us but can imagine a family would have issues.
greentricky-
Are they loud?
All of the ASHP units I've seen look like massive aircon units with big fans... I'm in a totally silent street where you can hear a fox fart at night... I've got a chance to think of green things like an ASHP over the next few months (already having boiler work done) but my concern is noise and vibration from the fan unit. This place being so unerringly quiet that any noise will be noticeable.
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I currently have a massive Megaflo tank with loads of capacity so I'm not too worried about running out. The noise further down thread is a bummer though :(
Velocio
jellybaby
Anyone replaced their boiler with an air source heat pump? Apparently there are some systems where you can keep your existing radiators so less disruptive to install.