New Electricity Tariff

[jon]

Overnight electricity used 29kWh @ 8.863p/kWh = £2.57027

Storage Heat 1 2.0kW Storage Heater 2 3.0kW Water Heater Top 3.0kW Water Temp 50C Water Heater Bottom 3.0kW Only for Boost Large Freezer 1.2kW Averaged over 24hrs Large Fridge 0.8kW Averaged over 24hrs

[Andy Bennet]

I would swop over your top and bottom heaters, you only want to heat the top for boost.

[Dave Liquorice]

Yep amd 50 C isn't really hot enough, doesn't relaibly kill legionella.

[jon]

Manual boost is not used during the night, so is not counted in used kWhs.

[jon]

Its worked ok for >20 years.

[Vir Campestris]

Depends what you mean by "boost"

I'd use the top heater most of the time, and only turn the bottom one on when I wanted a bath. No need to heat the bottom of the tank at all most of the time - half a tank should be OK or a shower.

Andy

[Max Demian]

Unless you're on Economy 7 in which case you run the bottom heater on off-peak.

[Dave Liquorice]

But if the boost heater is at the bottom you heat the whole tank when you use boost, not just the top.