Old oil boiler system

Joined
11 Aug 2010
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Location
Flintshire
Country
United Kingdom
Hi, daughter has just moved into a really nice old house. It's been really well looked after and has an oil central heating system.

All works great, however not familiar with this type of system. It has a Danfoss 102 24hr programmer, again all good with that.

When heating the hot water tank, there does not appear to be a tank thermostat. How does the boiler know when the tank is heated and therefore to switch off? Or maybe it just doesn't but wouldn't it just boil if left on?
 
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