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Do I need a pump?


Lesgrandepotato

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The pump in our old house packed up. It was some while before we actually noticed as the manifold pumps were doing a good job of circulating water from the boiler to the manifolds.  It was mainly the hot water heat up that suffered as gravity flow was limited.

 

So I would say no extra pump needed.

 

What does @Nickfromwales say?

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One I did a good while back was convection circulating over 17m of pipe away from the TS which went through an underground trench between the house and the garage ( new plant room ). 

No additinal pump needed afaic, unless it's the longest, most adverse run in history.

Rememver you do need motorised 2-port zone valves ( ZV ) at the TS for each flow as otherwise you'll get them all draining heat from the TS 24/7 with convection circulation ;)  

Use the orange and grey wires of the 5-wire ZV to switch the respective manifold pump on, as that way you'll never have the pump pulling on a closed or partially open ZV. 

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