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Which temperature sensor for a Steibel buffer and Ecodan?

 
Thermostats, Volumisers, Buffer Tanks, TRVs, Pumps, Piping, Valves, Radiators & Controls
Last Post by downfield 45 seconds ago
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downfield
 downfield
(@downfield)
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Joined: 10 months ago
Posts: 84
Topic starter 19/09/2025 10:28 pm  

My installer configured our Ecodan 14kW system with a 100 litre Steibel 4-port buffer (surprise) and I have recently had this converted into a volumiser in order for it to work better when in cooling mode (see other thread on rapid cycling when cooling with the old set-up).

Anyway, the buffer has "dry pocket" near the bottom for a temp sensor that uses a 14mm dia thread.

I would like to install a sensor and connect to the Ecodan controller so that it shows up on the temp graphs in iOS MELcloud app as "Mixing cylinder".  This line on the graph is currently unused.

I asked Steibel tech support for recommendations but they just said that they didn't supply a sensor and the type needed would depend on the heat pump.

Two questions:

1  what sensor to use that will fit and have the correct wiring

2  where to connect it in the control box.

There are lots of temp sensors with 14mm diameter threads on Google but they mostly seem to be for car engines not heat pumps...


Mitsubishi Zubadan 14kW with Mixergy 210l DHW in 220m2 barn property. 24 solar panels = 9kWp with GivEnergy 5.0kW Hybrid inverter and 19kWh GivE batteries. Jaga Strada fan-assisted rads throughout. Landvac vacuum glazing/triple glazed windows.


   
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