I phone a local firm to come and do a boiler service and write me out a gas safety certificate in June each year. They charged £85 last year, about ten quid more than the year before. I have home emergency cover on my house insurance but have never needed to use it in the 19 years I've been living here.
Ah, no actually I did have a disaster last year when I bled the radiator and the valve broke, sending a stream of water shooting out across the laminate floor. I called the "round the clock 24/7 emergency number" on the insurance and was told they could have a plumber at my house it two hours time. I was totally frazzled, the laminate was at risk of being ruined, and their idea of emergency coverage is "we can have someone there in a couple of hours!". They didn't even talk me through how to find the valve on the other side of the radiator that could be turned to switch off the incoming water supply. Just leave the old lady mopping frantically in an ever increasing lake of brown water, while your closest available plumber is a hundred miles away.
In desperation I called the local firm who do the annual boiler service, they said someone would be round in ten minutes, and talked me through switching off the water to the radiator over the phone. With the water no longer gushing I just had time to cancel the "for your peace of mind, 24 hour 365 days a year, emergency plumber" who was still 70 miles away before the local guy was ringing the doorbell.
They'd said 10 minutes but he got here in 7. A very calm chap, who reassured me that I wasn't to blame, explaining that that old valves do sometimes give out, and it wasn't due to my handfisted weilding of the radiator key. Then he changed the wrecked valve, mopped up all the water and charged me £72 including VAT for the work, including parts.
Just imagine if you'd been saving those £21/month payments into a reserve account, to be dipped into if/when the heating packed in. Chances are you'd soon build up a nice little fund, which would also come in handy when the washing machine or dishwasher decided to kark inconveniently.
All those individual insurance schemes seem like a bit of a swizz to me. Particularly the ones with hefty monthly fees. The reason all those energy firms push them so hard is that they are a nice little earner for them.