About what should be the KwH usage for our all-electric bungalow?

Mstty

I will presume all heating is off?

If you are using 13-20kwh a day in summer just heating water that is a great place to start. You will need to look to see if you are heating your water all day.

Rough guide 1 hour heats water to 50oC for two people taking showers and washing up out of the tank daily. If you set the system not to use the backup heater that's 1.5kwh a day

A weekly burn to 60oC removes any nasties from the tank. 2kwh extra for that day. For you that could mean hot water costing 650 kW a year

As a comparison using the above our water heating for the year is 520kW as we also adjust it down to 45oC in summer as we don't mind warm showers this time of year.

jdal

Mstty said:

I will presume all heating is off?

If you are using 13-20kwh a day in summer just heating water that is a great place to start. You will need to look to see if you are heating your water all day...

Good info. The 60degree blast is ok - 1hr per week. But our water controller IS on a timer ( I thought it wasn't) and it was set to constant. So I'll change it to 1hr per day and see how we get on. I think the maintenance bloke has screwed up and left the water on the "cont" setting

Mstty

jdal said:

Mstty said:

I will presume all heating is off?

If you are using 13-20kwh a day in summer just heating water that is a great place to start. You will need to look to see if you are heating your water all day...

Good info. The 60degree blast is ok - 1hr per week. But our water controller IS on a timer ( I thought it wasn't) and it was set to constant. So I'll change it to 1hr per day and see how we get on. I think the maintenance bloke has screwed up and left the water on the "cont" setting

Excellent good find that should save a good few pennies👍 well pounds lol

markin

13-20WwH in summer is terrible just for hot water.

The installers will simply say the setting are 'fine' and they likely just set them up the same no matter the house size, insulation or number of people. And they will always set them up for heat output over efficiency so that they never get a call back with complaints about it being cold or running out of water.

Its down to the user too learn and adjust things to their usage needs.

k_man

jdal said:

k_man said:

Also depends on your heating settings.
E.g is the room thermostat set to 22C 24/7, or 19C with setback to say, 16C overnight (these are for instances).

Also some people like to have windows open all year, even in winter, while heating us on.

This is assuming power used is mostly for heating.
Do you have monthly readings, to show the drop between winter and summer.
Your potentially high usage (although as above, 8000 seems about right) could be due to something else.

Finally, is the 8000 based on actual usage, or an estimated usage? The latter can be wide of the mark after changing providers.

Thanks for this. 8000 is accurate (ish), I keep a spreadsheet of meter readings. Heating 19/17. We keep windows closed. There are differences between Winter/Summer - daily usage is 30-35Kwh in winter,  13-20WwH in summer. I have just noticed a bit of a rise in the summer daily use. I need to analyse the data a bit more.

Is the 13 - 20 kWh in summer per day, all electricity use, or just that used by the ASHP?

[Deleted User]

Mstty said:

jdal said:

Mstty said:

I will presume all heating is off?

If you are using 13-20kwh a day in summer just heating water that is a great place to start. You will need to look to see if you are heating your water all day...

Good info. The 60degree blast is ok - 1hr per week. But our water controller IS on a timer ( I thought it wasn't) and it was set to constant. So I'll change it to 1hr per day and see how we get on. I think the maintenance bloke has screwed up and left the water on the "cont" setting

Excellent good find that should save a good few pennies👍 well pounds lol

A recent new build will have at least one thermostat fitted to the immersion heater so the HW cylinder will not be constantly heating as the word constant might suggest. My cylinder immersion heater is on constant but it uses excess solar rather than Grid power. The cylinder temperature is presently showing ‘maximum temperature limit’ and total usage of 2.33kWh. The cylinder temperature is set to 65C.

Mstty

Dolor said:

Mstty said:

jdal said:

Mstty said:

I will presume all heating is off?

If you are using 13-20kwh a day in summer just heating water that is a great place to start. You will need to look to see if you are heating your water all day...

Good info. The 60degree blast is ok - 1hr per week. But our water controller IS on a timer ( I thought it wasn't) and it was set to constant. So I'll change it to 1hr per day and see how we get on. I think the maintenance bloke has screwed up and left the water on the "cont" setting

Excellent good find that should save a good few pennies👍 well pounds lol

A recent new build will have at least one thermostat fitted to the immersion heater so the HW cylinder will not be constantly heating as the word constant might suggest. My cylinder immersion heater is on constant but it uses excess solar rather than Grid power. The cylinder temperature is presently showing ‘maximum temperature limit’ and total usage of 2.33kWh. The cylinder temperature is set to 65C.

We have done this to death on other posts I am not going to cover old ground on heat once versus all day. It would be like groundhog Day but it has been proven heat once saves money and kWh regardless of the amount.

Let the OP come back and report their savings but bear in mind I have also stated for them to check the backup electric heater is not kicking in as that will use probably 3kw when it kicks in.

Baby steps rather than a dog fight on another thread about heat once versus all day😔

I have posted my savings on two other posts heating once a day over constant and it was a not insignificant 2.5kw saving or 73p at today's rates £1.10p a day come October. Put another way a saving of £266.45 at today's rates a year and £401.50 a year from October then saving £410.63 a year from Jan 2023.

(For those tuning in this is an ASHP heated hot water cylinder 7 years old designed not retro fitted) For the summer months we have reduced consumption further using just 1kw of power into our ASHP takes us from its lowest after a days use temp of 23oC to 45oC + in 30 mins after taking out 2-3 showers plus approx 4 bowls of hot water in the sink.

Now that energy is so expensive a couple of kw a day makes a huge difference to the overall annual bill and this is what I intend to pass on to others like the OP.

After 30 mins of hot water heating starting at 4am this morning with the ASHP which was 0.95 kw costing 28p we have had 2 showers and 2 bowls of hot water and it's still 40oC 13 hours later

I don't see the fascination in constantly heating hot water through the day it always costs more than one heat. Even if some find the saving is less than our 2.5kw and it's 2kw a day as posted by Dolor below. 2kw a day for a year at current rates is over £200 and that will be over £320 a year people can save on Oct 22 price cap rates then £330 come Jan 2023. After all this is the Money Saving Expert forum.

Reed_Richards

jdal said:
...our water controller IS on a timer ( I thought it wasn't) and it was set to constant. So I'll change it to 1hr per day and see how we get on. ...

Mstty said:
We have done this to death on other posts ...

Too right - and its because the benefits of only setting your hot water heating to be On for a short period each day are sometimes overrated.  Do try it, there are three possible outcomes:

1. Your cylinder is very well insulated and your hot water usage is small so it makes no difference to your electricity consumption.  You always have enough hot water to meet your needs.
2. Your cylinder is not so well insulated and/or your hot water consumption is greater.  You notice that your hot water has got a bit tepid towards the hour when it is due to be heated again but acceptably so.  Your electricity consumption is somewhat reduced but this does not make a huge difference.
3. Some hours after your cylinder has been heated you find that your hot water is quite cool.  If you can put up with this and wait until after the next heating hour for your hot hot water then your electricity consumption will be significantly reduced.   

[Deleted User]

As we are talking about a new build in 2017, my guess is that the OP’s hot water cylinder will be very well insulated. I have a 250L unvented hot water cylinder and my stats over the past 18 months show that re-heating the cylinder continuously during the day, or overnight on off-peak overnight uses less than 3kWh a day. Re-heating the cylinder by gas uses in excess of 6kWh (boiler inefficiency; pipe runs losses etc) but that’s a different argument.

jdal

Mstty said:

I will presume all heating is off?
... (from a different post)
Let the OP come back and report their savings but bear in mind I have also stated for them to check the backup electric heater is not kicking in as that will use probably 3kw when it kicks in.

Yeah, heating is off now (previously we relied on the thermostat setting). Not sure what you mean by "Backup Electric Heater"?