Replacement of Electric Water Heaters in Buildings
Heating Technology
Measure Goal
The goal is to estimate the electricity savings triggered by replacing conventional electric water heaters in buildings with water heating powered by renewable energy sources (centralized or decentralized).
Symbols, Terms and Units
| Symbol | Description | Unit |
|---|---|---|
E | annual electricity consumption | kWh/a |
ΔEeco | cumulative electricity savings | kWh |
f | Factor | — |
Ns | Standard effective duration | a |
V | Hot water volume | l/d |
η | Utilization rate | — |
Calculation Formulas
Cumulative Electricity Savings
The cumulative electricity savings result from the difference between the electricity consumption of the old and new state, multiplied by the reduction factor and the standard effective duration.
Annual Electricity Consumption
The annual electricity consumption depends on the daily hot water demand and the heat losses of the storage and pipes.
Examples and Scenarios
Replacement of 10 decentralized electric boilers in a residential building with 6 primary residences and 4 secondary residences
Inputs
6 Erstwohnungen MFH, 4 Zweitwohnungen MFH
Replacement of a central electric boiler in a café with 20 seats
Inputs
20 Sitzplätze Restaurant / Café
Downloads
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