Energy chat

Can’t help wondering whether the bits of Australia with mineral resources and lots of solar/wind also have an abundance of water to split hydrogen from.

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The retrofit downstairs and uptairs ufh was switched on last week. We are still using an oil boiler at the moment. It’s been lovely and warm. It was 26C one day and the builders had to turn it down. I don’t know about running costs yet. I put it on frost mode over thew weekend.

The trick is to manage the flow temp going through the underfloor circuits.

There will be a blending valve on the manifold or thereabouts. Each installation is different but you are generally trying to keep it is low as poss to avoid overshoot but still the ability to maintain the desired room temp.

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Yes. Wundatherm mentioned that when they supplied it. We’ve fitted heatmiser, so hopefully control will be good.

Heatmiser are one of the best in the business.


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Just imagine people geeking out that much over eco tech data, who would do that?

Anyway, just had our bill for January with the heat pump running, and at the latest Octopus Go rates the cost would be a bit under £134 including £16 on car charging.

Total electricity usage of 794.2kWh, the equivalent last year had 1518kWh just of gas.


Is yours air-to-air or air-to-water?

Air to water using the radiators that were there from the existing boiler that was replaced. Having had one set of air pipes put in for the MVHR setup we were not doing that again…

…but I thought that normal rads don’t work properly with heat pumps because of the lower temperature water. Bigger rads with a much larger radiating area should be used.
Our rads are huge…

It depends what heat output you need given the heat losses and what temperature you run at. Our installer did the calcs and worked out that we would be fine with a 50C operating temperature.

This is how the flow temperatures worked yesterday with an overnight kick up of temperature during the Go period.

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The quote I got for the old place was air-to-air, but it didn’t have any air pipes - just outside compressors connected to interior wall mounted air-handling units with refrigerant pipes, similar to split air-con systems.