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What are the spots?carbon dioxide emissionsfuel costs They show the relative Cost Savings and Reduced CO2 emissions.

Money
Saving
Tips
 Energy 
Savings 
Each Year
 Money
Savings
Each Year
 CO2
Savings
Each Year
 Comments
dishwasher energy saving tips Dishwashers
Read More
30kWh -
90kWh
£4.62 -
£13.86

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11.01kg -
33.03kg
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Run the machine full and less often

boil less water in kettle energy saving tips Boiling Water
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82kWh -
164kWh
£12.628 -
£25.256

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30.09kg -
60.19kg
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Boil only what you need. Savings depend on how much tea you drink!

fridge freezer energy saving tips Fridge Freezers
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50kWh -
400kWh
£7.7 -
£61.6

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18.35kg -
146.8kg
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Fridge maintenance. Savings depend on size, age and rating

dmoney saving tips tumble drying Tumble Dryers
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90kWh -
350kWh
£13.86 -
£53.9

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33.03kg -
128.45kg
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Operate Less often, clean filters, part dry clothes?

differnce in cost of shallow or deep bath Baths
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700kWh -
1400kWh
£30.1 -
£215.6

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147kg -
513.8kg
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Have shallower baths and consider how you heat water

change energy supplier to save money Change Supplier
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0kWh -
0kWh
£0 -
£500

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0 -
0
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save money and have a beerSwitch! This is the single simplest way of saving money. This is equivalent to 100 pints of beer!

shower or power shower which is cheaper Shower of Power Shower
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120kWh -
1100kWh
£18.48 -
£242

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25.2kg -
403.7kg
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Aviod immersion heated power showers

save money and energy with good loft insulation Install Loft Insulation
Read More
3000kWh -
3750kWh
£129 -
£161.25

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630kg -
787.5kg
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Modern loft insulation in a 3 bed semi - these numbers are for Gas, savings are greater for other fuels

save money and energy with good loft insulation Improve Loft Insulation
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1000kWh -
1500kWh
£43 -
£64.5

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210kg -
315kg
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Modern loft insulation in a 3 bed semi - these numbers are for Gas, savings are greater for other fuels

This table is under construction there are more tips here.

Measures to reduce fuel bills: ROI* is the time it takes in years to return the investment in fuel savings for an average gas heated 3 bed semi-detached house.
Measure ROI*
hot water tank insulation save energy save money Lagging 1 Year
loft insulation energy saving Loft Insulation 2 Years
cavity wall insulation energy saving Cavity Wall Insulation 2.3 Years
underfloor insulation energy saving Underfloor Insulation 4.4 Years
solid wall insulation energy saving Solid Wall Insulation 15.8 Years
double glazing energy saving Double Glazing 58.1 Years
Renewable Energy Measures ROI** is the time it takes in years to return the investment in energy. The table assumes no government incentive schemes are used (FIT or RHI).
Measure ROI**
solar hot water energy saving costs Solar Hot Water 11 to 62 Years
ground source heat pump investment costs Heat Pumps 4 to 81 Years
domestic wind power costs Wind Power 16 to 32 Years
solar PV costs and investment Solar Photovoltaics 13 ± 3 Years

Shallow Bath or Deep Bath

Last Updated on Thursday, 30 March 2017 14:41


differnce in cost of shallow or deep bath
 Energy Saving:  700 - 1400 kWh each year
 Money Saving:   £30.1 -  £215.6 each year
 CO2 Saving:  147kg - 513.8kg each year
 Comment:  Have shallower baths and consider how you heat water
 Energy range that could be saved with this measure.
 Money Savings range you could have employing this measure.
 Carbon Dioxide emission range that could be saved with this measure.

How much does it cost to have a bath?


The main costs involved in washing yourself relate to the cost of heating water and bathing uses a lot of hot water.

Gas, electricity, solar energy or solid fuels like coal can all be used to heat water in the domestic environment. Solar water heating and solid fuels are considered in more detail in separate articles. To make the comparison between deep and shallow baths only gas and electric immersion heating are considered.

There is a wild variation in bath size, preference on how full you like to have a bath, the temperature of the water you prefer and indeed the temperature of the water coming into your property. All of these factors will influence how much it costs you to have a bath. The examples shown below are a 100 litre, a 150 litre and a 200 litre bath volume with a bathing temperature of 40oC and an incoming water temperature of 10oC. 100 litres would be a relatively shallow bath and 200 liters quite deep for most of us.

Cost of a single bath with different bath volumes, with electrical and gas water heating and associated CO2 emissions.
Modern Gas Boiler Electrical Immersion Heater
Small (100 litre) £0.187 (0.7kg) £0.597 (1.3kg)
Medium (150 litre) £0.281 (1.1kg) £0.895 (1.9kg)
Deep (200 litre) £0.375 (1.5kg) £1.193 (2.6kg)
Cost of a bath a day for a year with different bath volumes, with electrical and gas water heating and associated CO2 emissions.
Modern Gas Boiler Electrical Immersion Heater
Small (100 litre) £68.457 (267.5kg) £217.932 (467.4kg)
Medium (150 litre) £102.676 (401.2kg) £326.866 (701.1kg)
Deep (200 litre) £136.836 (534.6kg) £435.613 (934.3kg)

The conclusion is obvious here if you can avoid it do not use an immersion heater to heat your bath water, it is expensive, although there are immersion heaters that operate on ecomomy 7. It is also clear that you could save considerably by just having shallower baths, more difficult to do in the cold winter months!

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0 # DisplacementStephen Phillips 2016-05-26 17:29
Do your bath volumes allow for occupant displacement?

I displace well over 100 litres; my wife and teenage son each well under 50 litres.

So my "full to the overflow" quite deep old cast iron bath is not much over 100 litres of hot water - a fact cross checked by our 117 litre hot water tank needing to be run to cold but not much more to fill it from only the hot tap.

How much extra energy do I use to warm up old thick cast iron compared to modern plastic? Non-trivial I think.
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0 # combi boilersRiley 2013-02-28 13:25
we had the old sytem, gas boiler heating hot water tank and radiators. New system meant siting new boiler in utility, heating is much improved, BUT hot water system in quite inferior to old system. I could;nt recommend this new hot water system to anyone!!!
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0 # combi boiler settingsDonald 2012-10-07 17:41
Hi, am having a combi boiler fitted, wonder what the average boiler hot water temperature range should be to give a comfortable bath/ shower, as have a old system with copper hot water cylinder at present. thanx for any info
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0 # CalculationRees 2012-01-08 17:38
Hi interesting article !

Can you show your calculation so that I can add the rate I am buying gas from my provider to see what a bath costs !

Rees
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+2 # CalculationRichard 2012-01-11 14:49
does this help??

T1 = temp of cold water (K), K is Kelvin
T2 = temp of hot bath water (K)
V = volume of bath water used (litres)
S = specific heat capacity of water = 4.18 J/cm3/K

ener gy to heat the water is therefore

Ej = S*(T2-T1)*V*100 0 the 1000 to get units in Joules

to factor in boiler efficiency (Beff in percent, 90% probably)

Eb = Ej (1 + (100-Beff)/100)

1 kWh = 3600000 Joules

conve rt to kWh

Eb (kWh) = Eb/3600000

c ost to heat bath per bath = Eb (kWh) * Cost per kWh
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0 # Please Specify when the calculations were donePeter Bolton 2011-02-22 19:48
given the ever changing (always increasing!) cost of gas and electricity, can you add a note to show when these calculations were done.
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+1 # when were the calcs doneRichard 2011-02-28 14:24
All the calculations on this site are based on one variables file which is updated each year. The last update was in May 2010. All the calculations on the site will change when this file is updated in a few weeks. The current rates are shown on the home page in the bar chart, this is also updated in the same way.

perhaps I should add this date to each calculation?

All the best

richard
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