It's not inverter driven. I wasn't thinking you were about to slag it off, but trust me that if I do mention the brand, there will be a whole chorus of jeering, telling me it's rubbish. I'm basing this on posts in other threads. Don't think it matters for now, I'll share later if people are interested.
The DT was even higher till I cranked up the flow rate!! The Wilo Stratos Pico has adjustable flow rate, and the screen readout tells me I'm at maximum at 4000 litres/hour.
I've been letting the heat pump run and stabilise, although to be honest, it makes little difference. Seems to start out at a DT of 14 and stay there with outlet temperature gradually rising from 43 to 48 when the thermostat cuts out. I mentioned in another post, that I'm running the heat pump into a buffer tank. Would that result in the stable DT? Why do you think it's high?
Do you have a pump valve you can throttle down to see if it effects the displayed flow rate on the display?
What size pump is it you've installed? Looking at the info, my guess would be a 1-6 which at max would give you a theoretical flow rate of about 4m3 p/hr, or 4000 litres...
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