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TMV or not?

View the thread, titled "TMV or not?" which is posted in Central Heating Forum on UK Plumbers Forums.

My old system that was a vented thermal storage tank. Fitted to it was a TMV ensuring safe hot water.

I had fitted a new S Plan, unvented system and found the water is coming out very hot. I’ve ensured the tank temperature is 60ish. But it seems the new system doesn’t have a TMV.

Question:
1. Is this normal to not fit a TMV?
2. Should I get one fitted or live with the hotter water? Do the pros of TMVs get outweighed by Cons? Not sure why one wasn’t fitted or the previous one reused?

Kids in the house keeps me worried without them.
 

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