Its like you are living in the 19th century. We have controls inside the house to set the temperature, no messing with mixer taps to try and get the temperature where you want it.
Do you have multiple boilers too for when there are more than one person in the house and they want different water temp? What about when the washing machine fills (if it's a hot fill model)?
In the UK the heating systems are fairly simple and as someone correctly pointed out the "heating season" is most of the year. In fact I run my heating at least 30 minutes every morning 365 days a year. In summer here, if it's sunny and/or warm then you really don't need the heating, but "summer" here in Northern Ireland is about one, maybe two weeks, before it returns to cloudy, rainy, cool and damp again and the heating will be needed the odd evening. From September to May it's needed at least 1-2 hours a day, more like 4-8 hours a day in winter when it's -2*C in the mornings, is dawn at 9am, dusk at 4pm and the temp barely gets above 5*C most days.
19th century, no, but my house, like the vast majority of them was build decades ago (1968 actually). There are houses around here build 100 years ago. Sure they could be modernised (and I'm trying to modernise mine), but there are limits to what you can do depending on your budget. New builds with vast acreage are very rare here, unless you want to live in the middle or nowhere or can afford to spend millions on your house. I gather that is not quite the same as Aus. A 3 bed semi detached with a total of aprox. 100m
2 footprint is circa 150,000GBP, a large detached house with 200m2 is going to cost you 300,000GBP. Renovating that £150,000 house to be all modern tech like your image suggests will cost you 30,000-100,000GBP. Even just a new basic heating system will cost me 3,000-5,000.