SteamyTea

That should be easy enough to set up. Is the current very low, and at what voltage is needed?

I don't know the inner workings of a SA too well, only seen an early version. I suspect that for material longevity, and very little performance gain, the heater cuts out at the optimum charge temperature. So a little above 58°C. This will also reduce expansion. Phase change materials are odd things. They can be charged up i.e. change from solid to liquid, then allowed to cool while still in the liquid phase. Then they can be activated to change phase, releasing the energy at the phase change temperature. This partly accounts for the low standing losses of the SA units. If they did overheat the material, that extra energy would relatively quickly be lost to the atmosphere (the small amount of vacuum panel insulation is to brilliant at retaining a 55°C temp difference). So this heating regime may account for the pulsing, it is just limiting the power being inputted, which also limits the overall temperature.

Yes I did.

I made a deal once.

That is a circular argument and the kind of thing an accountant would say. An economist would say that you have not taken into account the external costs.

Then keep going, it eventually works. Purely from an educational academic viewpoint, reading is not a very successful way to learn things for most people. But as you have no choice, keep reading.

I told my students to read until they did not understand it. Then start from the beginning again. Eventually it sinks in.

An good electric shower is the simplest and easiest solution. You need to calculate i.e. read the meter before and after the shower heating period, to work out a payback. But then payback is an odd concept. Do you calculate the payback of different food types, different plants in your garden, different types of pets. No. So why should choosing a long term reduction in your overall energy bill, be compared to not getting your system sorted (if you pay the right amount, someone will fix it).

You may find that in the summer, you are better off setting the TS heating period to switch off just before your normal usage time. This reduces the thermal loss time. It does seem barmy that you are heating, to a certain extent, half a tonne of water for a 30 litre, or even 150 litre shower. I would fit a simple electric shower. Or get that ST sorted, which is probably part of the reason you have the set up you have. You could junk the ST and fit a simple PV system that just dumps into your thermal store. ask @ProDave to sort it, he is always in need of cash to pay for the losses on his build.

Yes, but it is what it is. My car does not have an MP3 player, I live it it. With this old thermally leaky house, a third temperature/time option is not necessary. It is also just a matter of changing the controller to a better one. Sooner or later, Zoothorn needs to take ownership of it and sort it himself. We have pointed out just about as much as we can, and just get the same 'finger pointing' response back "it is there fault".

Read the (expletive deleted) manual, page 13.

Yes, and when it has changed phase there is not a great deal of energy stored.

Does your space heating system also draw from the thermal store? If not, do you have any idea what the temperature gradient is. I heat my basic E7 cylinder to 40°C now (used to be 50°C but reduced it for an experiment) and can eke out two baths, just,

And then it is 'No'.

Depends on the size of the heat pump and radiators. Not necessarily, may be more noticeably when it turns off. This does really depend on how noisy it is, and how sensitive the occupants are to the noise. I cannot stay in a place with barking dogs or crying babies, wailing women and dot matrix printers.

And just think how much better it would have been if you had had all your windows sealed they way you wanted.

Isn't that set on the thermostat. In the olded days, these were very basic, bi-metalic strips that just turned off at a set temperature, then turned on again when the room had dropped a couple of degrees. For some reason they were often placed in a cold and drafty hallway. There was usually a secondary timer used to set the on off times. These where mechanical as well, and you had to pull or push pins in or out. These days they have electronic units that can be set up for different temperatures at different times, and even different settings for weekends. They are often wireless and can have other sensors attached to them, wirelessly. It is this unit that can be used to set different temperatures at different times, and by setting the 'set back' temperature very low, effectively turn the ASHP off. Do you have one of these? If so, send a picture of it or the make and model number.

Here is today's outside data. I think my sensors has got flooded.

So does this ASHP only do Hot Water.

To a certain extent, the timings can be set with trial and error. Do you now how your MVHR fan speed is controlled?

Sample every 5 minutes, if second value is equal to previous value +5%, then switch on. If next value is previous value -5%, switch off. (Switch on and off could be a change in fan speed) May need a bit more polishing i.e. if switched on, delay next reading for 15 minutes.

Would a simple logger with inside and outside temp/RH sensors be useful. Once the scale of the problem us known, it is fairly easy to design a switching system to cope with it. Though I think @MJNewton has the right idea, rate of change.

I think I have the same problem with my front door. South facing, but the porch is SW facing. When I get home I shall open it. Pretty sure it will let out half a cup of water. Been like it for 15 years that I know of, probably longer.

Refresh all our memories. Did you already have a wet system in and when the ASHP was fitted this pressure/water loss first started. Or did you already have to repressurise the system before the ASHP was first installed.

As a kids bike from Frog costs about 300 quid, I don't think they are competing with mainstream manufacturers. But this must be why MG don't sell many cars in the UK, Bentley have stolen the market.