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Calculations and methodology

For the annual and daily hot water costs
InLine Hot Water System is A-Rated
InLine Hot Water System is A-Rated
The figures for heating water with Logicor's InLine Hot Water System are taken from actual measurements on a real system taken using industry standard power analyser equipment (Precision Power Scope PX8000) from Yokogawa with an accuracy of 0.01%.

Our calculation method for the cost of heating bath water with an Electric Immersion Heater and Modern A-Rated Gas Heater is outlined below.

Last calculations made 18 December 2015.

T1 = Temperature of cold water entering system in Kelvin (K)
T2 = Temperature of hot bath water in Kelvin (K)
V = Volume of bath water  (litres)
S = Specific heat capacity of water is  4.18 J/cm3/K
Be = Boiler efficiency (A-Rated is assumed 90%)
EJ = Energy required to heat water in Joules
EB= Energy required to heat water with boiler efficiency adjustment
C = Cost to heat one bath
  • The assumed water temperature entering the heater is 10°C.
  • The assumed water temperature leaving the heater into the bath is 40°C.
  • Energy prices are taken from the Energy Saving Trust website based on the average rate for domestic households in England, Scotland & Wales, last checked February 2015.
  • Source: www.energysavingtrust.org.uk/content/our-calculations
  • Electricity average price (Standard Rate) : 14.05 pence / kWh
  • Gas average price (Standard Rate) : 4.29 pence / kWh
(EJ) Energy required to heat the water in Joules is therefore :
EJ (in Joules) = S x (T2-T1) x V x 1000

Adjustment  to account for the boiler efficiency (EB in Joules) is therefore :
EB (in Joules) = EJ x  ((1 + (100-Be)) / 100)

To convert Joules to kWh (1 kWh = 3600000 Joules) is therefore :
EB (in kWh) = EB (in Joules) / 3600000

(C) The cost to heat one bath in kWh is therefore:
C = EB x Energy price per kWh
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Logicor (CH) Ltd.  Unit 7, Thornes Office Park, Monckton Road, Wakefield, WF2 7AN, United Kingdom

Logicor (CH) Limited is an Appointed Representative of Improveasy Ltd., a company registered in England and Wales (Co. Reg. number 7807352). Registered Office: Manchester Business Park, 3000 Aviator Way, Manchester M22 5TG. The firm is authorised and regulated by the Financial Conduct Authority (FRN 708623). The firm is authorised as a Broker, not a Lender, and offers credit facilities from a panel/one lender. The credit is subject to application and status.

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CHS : GB 1705471.9, Worldwide PCT/GB2014/050913 and  Great Britain 1315141.0 Patents Pending; Conforms to UL Standard UL 499 & Certified to CAN/CSA E60335-2-30 & WO2019/025756
CHS & ILHWS : PCT/GB2018/050571
ILHWS : GB 1705471.9, Worldwide Patents Pending and Great Britain 1704497.5 Patent Pending;  Worldwide PCT/GB2018/050541, WO2018/172729
LCHIC : WO2018/185454


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