| Many boilers are indirectly heated by the central heating unit. A three way valve directs the hot water from the normal circuit to the boile...
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![Early detection of boiler three way valve failure [130140-I]](https://cdn.xingosoftware.com/elektor/images/fetch/dpr_1,w_800,h_340,c_fit/https%3A%2F%2Fwww.elektormagazine.com%2Fassets%2Fupload%2Fimages%2F44%2F20160518111155_no-project-image.png)
| Many boilers are indirectly heated by the central heating unit. A three way valve directs the hot water from the normal circuit to the boile...