Heating in Ireland is weird. Most urban buildings use piped gas or in rare cases electricity nowadays, but an external oil or diesel tank was common for new construction in Dublin even 30 or 40 years ago (like I lived in a house in Tallaght for about a year that had an oil tank, but is like 50 years younger than the house I live in now that has gas), and plenty of rural areas still use liquid fuel or even solid fuel-burning stoves as their primary heat source. So depending on age and location and whether it was renovated, it’s entirely plausible that all they have is the diesel tank.
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