Boilers never seem to pack in during the summer, do they? They wait until its brass monkeys & think, nope not switching on today. Result, you waken to freezing rooms & ice cold water. Wasn't that how it used to be when we were little? Certainly was in my house. Coal fires, which took until the afternoon to heat a room. Immersion for hot water, but only once a day. We're spoiled these days.