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Last seen: Apr 8, 2025
1970's 4 bed detached house with loft and cavity insulation in central southern England heated by a 7kW Vaillant Arotherm+. 508kWh used in January acc...
This situation provides a good example of the challenges of retro-fitting heat pumps to existing housing. Is there a technical reason for not fitting ...
Would bigger emitters compensate for the lower water temperature in the cooler rooms? Something extra in the living room might be sufficient as some h...
1. Are all your radiator valves (both any thermostatic valves and the lockshield valves) fully open? 2. What diameter is your pipework to the radiat...
Here's a couple of thermal images of my cylinder and pipework which have turned what was the coldest room in the house (NE corner) into the warmest de...
I caught my Arotherm+ heat pump at the end of a defrost cycle this morning when the OAT was about 0C. I then checked the data provided by the Vaillant...
I probably fit into the Eco-tech savvy group with the heat pump investment helped by the current government support. However, as a retired engineer, I...
It seems to be normal practice to put the filter on the return pipe to the heat pump so it catches any debris from the main heating system before it g...
I've just been and checked: My 28mm pipework includes a 22mm mag filter (with isolator valves) and works fine. Think of it as a short section of singl...
That looks to me to be a sound approach: Use the bigger pipe size to where the flow splits to the two heating circuits.
Less friction means less effort by the pump. The primary circuit for my 7kW Arotherm+ heat pump uses 28mm pipe and is running happily. The extra volum...
The hydraulic friction losses are in proportion to the square of the flow velocity x length. For example the friction loss of a given flow through 22m...
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