SteamyTea

Simple way to check for heat loss is to put a thermometer on the cylinder. Then work out the power loss from the temp difference and surface area.

You have never kept fish then. My first tank had an airlift filter, oh how I yearned for a proper pumped one.

Not like my house I hope. The light switch is not near the main door, but on the opposite wall. Probably designed that way by an architect, who knew he would never live in the place.

Just had a look at my data for last week, base load is 30W.

I cannot see any advantage in this LV idea. If it is to save money, buy one less device, or cut showering time by 10 seconds. 8 Copper has an embodied energy between 30 and 90 MJ/kg. Taking the lowest EE and assuming you put in 5 kg of copper, that is 42 kWh. Now my phone has a 5 AH battery. So 0.025 kWh. Or, before system losses, I would have to charge it 1700 hours to pay back the energy debt, that is about 2.5 months. I doubt it has had that much charging in its, so far, 4 year life.

Shall get my spoon, lighter and other tools out.

Depends how you round, or truncate the numbers. By high temporal sampling or Wh counting. I use Wh counting and it is very revealing, even though I know I may be almost 1Wh out at any time. 3.6 kJ I can live with as accuracy.

True, except for everything. You not got a MacSalvors near you, though you are not too far from a Jim's Tackle.

Not been into, or even though, Truro for years now. I am told they have a Cafe Nero there.

Pipe or anus?

It may have that capability, does not mean it is used. Hate to say it @patp, but I suspect you missed the boat on the last year's exports. Just bite the bullet and get a proper contract with them, they seem to be offering the best rates. There is ideology and there is pragmatism. Go for the latter when money is involved.

Welcome. No mention of improving the insulation levels and airtightness. I have had 2 Victorian terraces and one Victorian semi. All horrible to work on and all built differently. Like QE2 V lived a long time.

Better than regulations, and almost good enough to get an advantage from MVHR. Do you know where the major leaks were? Can then be rectified?

Welcome. All I got was a silver spoon.

Yes, a half decent drill is well worth considering. I have a cheap Screwfix Titan drill , pretty good for general DIY. https://www.screwfix.com/p/titan-tti886drs-18v-2-x-2-0ah-li-ion-txp-cordless-drill-driver/328PV A tape measure, some sort of straight edge, a set square are also useful, and some drill bits (Middle of Lidl). If you remember your school physics, triangulation is useful.

Just go for it. If it fails, work out why, then try again. It is only a woodshed.

Are freezers like pianos and women. If they are not upright, they are grand.

Post the old one back to them, but without any stamps on it.

Knowing how much you can loose: Partner Children Friends Dignity Time Body Parts Tools . . . . . .

@LeanTwo Are you looking to improve something i.e. flow rate on shower, or just looking to change an old broken system? There is little difference between a properly set up vented or unvented system thermally (though others will argue against this). The physics is the same i.e. pump x amount of water at y°C will be your power deliver, store x amount of water at Δy°C is your energy.

What sort are they, DS18B20?

Think most DC cable for PV is rated up to 1000V, though most are calculated on 600V these days. It may be buried in this old standard. https://www.bre.co.uk/filelibrary/pdf/rpts/Guide_to_the_installation_of_PV_systems_2nd_Edition.pdf

Yes, but just had to say it, boredom was kicking in after a long, 6 hour, car journey.

Not sure what the F& E will be used for with an unvented cylinder. What sort of control is on the stove to stop over temperature?

Just think, you can have that homo erotic relationship with Will Smith, and no one will be around to care.