What difference will tank lagging make, I have noted pre-lag kWh, what will be the result a week from now?

[ericmark]

Now over a week, so this seems to be the new usage figure. Compared with this before the jacket was fitted, the figure also shows what using an immersion heater costs to run, just over £1 per week, using off-peak at 8.5p/kWh and £4 per week at 30p/kWh, or £2 per week at 15p/kWh which is the amount of revenue lost as not exporting solar.

As to the jacked at 15p/kWh, it will take 43 weeks to get my money back. Hardly worth it.

 

[Justin Passing]

Stick a £5 electronic temperature probe into the insulation against the copper. It'll give a reading to 0.1° or so. You can time things.

A meat thermometer at a pinch, but I use one of these. Batteries last a couple of months.

SMaller number is temp.

 

[lostinthelight]

We are on deemed export so pays to use the excess for heating DHW

 

[ericmark]

We are on deemed export so pays to use the excess for heating DHW

Oh, I wish I had installed solar panels back then, and I suppose that is what the iboost+ was designed for, before we had batteries and a meter recording how much we export, the figure you show seems rather high this was before the extra insulation was added, so 160.96 kWh I suppose either shower or bath used with that hot water?