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Electric Boiler Usage: Monthly Costs, Tariffs, and Water Temperature Maintenance

Radoslaw88 102921 31
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How much does it cost to heat domestic hot water with an electric boiler for two people, which tariff is best, and how quickly does the water cool down?

The cost is highly usage-dependent, but the thread gives rough examples ranging from about PLN 50/month to around PLN 100–150/month for two people, with one very rough estimate saying to budget PLN 150–300 extra on the electricity bill [#14408466] [#14381638] [#14381290] A more technical estimate says that for 2 people using about 3 m³/month of hot water heated from 8°C to 40°C, the heating energy is about 112 kWh/month before standby losses, and total monthly demand can end up around 150 kWh once boiler losses are included [#14383417] For tariffs, G12/G12W with a timer is recommended because you can heat the boiler in cheap hours; G12W can be especially useful if you also do other household chores on weekends, while G11 makes a storage boiler less attractive and a flow heater was suggested as the more natural fit there [#14408466] [#14383417] How fast the water cools depends mainly on boiler size, insulation, set temperature, and room temperature; one user said a 50 L boiler was optimal for two people, another noted an 80 L boiler gives a bit more buffer, and a well-insulated 200 L boiler lost only about 300 Wh per day with the evening temperature just 1°C above morning [#14381638] [#14408466] A practical rule of thumb from the thread is about 1,000 kWh per person per year for hot water, then adjust it to your actual shower/bath habits and insulation quality [#14408466]
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  • #31 18423285
    gaz4
    Level 34  
    Posts: 4920
    Help: 77
    Rate: 2926
    Bemx2k wrote:
    I skipped heating the water with electricity after this test and I continue to heat it with pellets even in summer because it is a bit cheaper.


    And have you thought about the G12as tariff? Electricity during the day costs the same as in G11, but almost 3x cheaper at night (approx. PLN 0.20 / kWh). When using it, it is more profitable to heat with a heater than with pellets, sometimes even in winter. Unfortunately, there are some limits, so because of this test, you should wait a year, reducing electricity consumption during this time.

    NOx emitted in summer by gas and pellet boilers etc. increases ozone pollution. It is not worth using them when there is a more convenient and cheaper alternative up your sleeve.
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  • #32 18423293
    Bałdyzer
    Level 12  
    Posts: 1396
    Rate: 225
    It's weird your wear. Do you have a heat-insulated boiler or do you not have a calcareous heater? .
    I live with four adults, my in-laws have a shower, we have a bath, we do not save hot water, daily bathing, washing dishes, etc. and daily consumption in the summer season is from 8 to 10kw / h, which gives a maximum of 300kw / h per month, but at the price 0.25 groszy for 1 kw / h, the monthly cost is a maximum of PLN 75, but most often it is below PLN 70
    Hot water is profitable to heat electrically, but with tariffs G12 or G12W, the boiler should be connected to the socket via a timer (cost PLN 40) and then each 1 kW / h taken costs not 60 groszy, but 25 groszy. At a price of 60 groszy, there is no point in heating with electricity.
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Topic summary

✨ The discussion revolves around the usage and costs associated with electric boilers for domestic hot water heating. Users share insights on the monthly electricity costs for different boiler sizes, with estimates ranging from PLN 60 to PLN 300 depending on usage patterns and tariffs. The Ariston brand is frequently mentioned, particularly the Ariston Velis 80L model, which is noted for its efficiency in heating water to around 45 degrees Celsius. Participants discuss the impact of different electricity tariffs (G11, G12, G12W) on overall costs, with suggestions for using timers to optimize heating during cheaper rates. The conversation also touches on heat loss, water temperature maintenance, and comparisons with gas heating systems. Overall, the forum provides a comprehensive overview of factors influencing electric boiler efficiency and cost-effectiveness.
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FAQ

TL;DR: Heating a 50 L electric boiler for 2 people adds ~100 PLN/month; “two people should not exceed 150 PLN” [Elektroda, oregon25, post #14381638] Pick G12/G12w tariffs and a timer to halve kWh price, aiming for 7–10 kWh/day.

Why it matters: Correct sizing, tariff choice and insulation can cut hot-water bills by 40 % or more.

Quick Facts

• 7–10 kWh/day for a 100 L tank = 1.8–2.5 PLN on cheap G12W rate [Elektroda, Bałdyzer, #17993092; kortyleski, #17993706] • Stand-by loss: Ariston Velis 80 L ≈1.2 kWh/day at 60 °C [Elektroda, Radoslaw88, post #14381484] • Typical annual energy per person: 500–1000 kWh [Elektroda, gaz4, post #14410717] • G12 night rate ≈0.25 PLN/kWh vs G11 ≈0.60 PLN/kWh [Elektroda, Bałdyzer, post #17993092] • Flow heater needs ≥18 kW three-phase; single-phase limit 5 kW [Elektroda, jack63, post #14383417]

1. How much will an 80 L electric boiler cost for two adults each month?

Users report 7–8 kWh/day with timers, giving 210–240 kWh/month. At 0.25 PLN/kWh (G12 night) that is 53–60 PLN; at 0.60 PLN/kWh (G11) it rises to 126–144 PLN [Elektroda, Bałdyzer, #17993092; Radoslaw88, #14381484].

2. Which tariff is the cheapest for water heating?

G12 or G12w cuts night and weekend energy to ~0.25 PLN/kWh—about 60 % less than flat G11 [Elektroda, Bałdyzer, post #17993092] A timer ensures the heater only runs in cheap periods, maximising savings.

4. Does a larger tank always cost more to run?

A bigger tank means more surface area, yet it lets you store water at a lower temperature. Lower ΔT offsets some surface loss, so running cost per litre can stay similar [Elektroda, jack63, post #14383417]

6. How many kWh per person per year should I budget for hot water?

Allow 500–1000 kWh. Careful users with efficient shower heads hit 500 kWh; long baths push the upper band [Elektroda, gaz4, post #14410717]

7. What element size suits a flow heater?

For endless hot water at 45 °C with 10 °C inlet, you need about 18 kW (three-phase). Single-phase 5 kW units give lukewarm flow only 4 L/min [Elektroda, jack63, post #14383417]

8. How do I quickly estimate daily boiler energy use?

  1. Multiply tank litres by 0.06 kWh to heat from 15 °C to 45 °C.
  2. Add standby loss (label value).
  3. Multiply by fills per day.
    Example: 80 L ×0.06=4.8 kWh +1.2 kWh loss ≈6 kWh/day [Elektroda, Radoslaw88, post #14381484]

9. What edge case inflates bills unexpectedly?

Limescale on the heater element can raise energy use by 30 % because the element over-heats and cycles longer [Carbon Trust Hot Water Guide]. Descale yearly in hard-water areas.

10. Are heat-pump water heaters worth it?

They cut kWh by 50–65 % but cost several times more upfront. Viable for large households or when off-peak power is unavailable [Elektroda, jack63, post #14384541]

11. Is pellet or coal heating cheaper in summer?

One user spent 5 kg coal/day (~4 PLN) for 4 people; switching to a 2 kW electric element on G12W halved cost to ~60 PLN/month and removed maintenance work [Elektroda, Bałdyzer, post #17993092]

12. How can I cut standby losses on an existing cylinder?

Wrap the jacket with aluminium-foil backed foam and seal the top lid. A user saw overnight drop fall to 1 °C after this DIY tweak [Elektroda, gaz4, post #14408466]
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