Last updated: August 2026
Storage heaters still heat well over a hundred thousand Irish homes - electricity was the central heating fuel in roughly one in twelve households at the last Census - and most of their owners are either quietly overpaying or sitting on an unexploited bargain, depending entirely on their tariff and timer settings. The idea is sound: charge up ceramic bricks with cheap night-rate electricity, release the heat through the day. Old units leak heat at dawn and leave you cold (and topping up expensively) by evening; modern high-heat-retention models fix most of that. This guide covers how storage heaters actually work, what they cost to run on 2026 tariffs, whether to fix, upgrade or replace yours - and the grant reality (including the €4,000 bonus for scrapping them for a heat pump).
⚡ Quick Summary
🌿 The principle: charge overnight at ~17-21c/kWh night rates, release heat during the day - avoiding day units at ~35-38c.
🌿 Running cost: a typical 2 kW storage heater charging 8 hours costs roughly €1.30-€2.40 a night on night-rate tariffs.
🌿 Old vs new: modern high-heat-retention (HHR) heaters keep ~45% more heat until evening and have thermostats and fans - a different product from 1980s bricks.
🌿 The must-have: a night-rate or smart tariff - storage heating on a 24-hour rate is the dearest heating in Ireland.
🌿 No grant for new storage heaters - but swapping them for a heat pump unlocks the €4,000 Renewable Heat Bonus plus the €6,500 pump grant.
🌿 Verdict: keep and optimise if the fabric is good and units are modern; plan the heat-pump exit if they're old and the house leaks.
🔥 How Storage Heaters Actually Work
Inside the casing sit dense ceramic or clay bricks around electric elements. Overnight - when your meter is on its cheap register - the elements heat the bricks to several hundred degrees; through the day the bricks radiate that heat back into the room. Two controls matter:
🌿 Input: how hard to charge tonight (set by tomorrow's weather - most people leave it maxed and waste money in mild spells).
🌿 Output: how fast to release heat (close it in the morning, open it for the evening - or the bricks are spent by 3pm).
Old units rely on you juggling those dials daily. Modern HHR units automate it: better insulation around the bricks, room thermostats, quiet fans and weather-adaptive charging - which is why like-for-like replacements cut bills even before tariff changes.
💶 What Storage Heating Costs to Run in 2026
The entire economics hinge on your tariff:
🌿 On a night rate (~17-21c/kWh): a 2 kW heater charging 8 hours ≈ 16 kWh → €2.70-€3.40 per heater per night. A three-heater home: roughly €240-€300 a month in the depths of winter.
🌿 On a standard 24-hour rate (~35-38c): the same charge costs €5.60-€6.10 per heater per night - storage heating without a night tariff is a money bonfire.
🌿 The panel-heater trap: using plug-in convectors at 33c day rate to "top up" spent storage heaters is where these homes' bills explode - fix the charge/output settings first. Our electric heater running costs guide has the per-hour numbers.
Which night tariff suits depends on your usage pattern - our night rate guide runs the comparison, and our average bill guide shows how your total stacks up.
🔧 Fix, Upgrade or Replace?
🌿 Fix (free): get the input/output dials right, charge to the weather, close output overnight and mornings. On a smart tariff, align charging with the cheapest window. This alone rescues many "broken" systems.
🌿 Upgrade (€600-€1,200 per unit installed): modern HHR heaters - thermostats, fans, ~45% better heat retention. Worth it where the home suits electric heating and a heat pump isn't realistic (apartments especially, where landlords and management companies limit options).
🌿 Replace with a heat pump: the big move. Storage heating counts as electric heating for the €4,000 Renewable Heat Bonus, stacking with the €6,500 pump grant and €2,000 heating-system grant - up to €12,500 off an air-to-water heat pump that delivers 3-4× the heat per unit of electricity.
🌿 Whatever you choose, insulate first: storage heat is slow to respond, so a leaky house feels it worst - the attic and wall grants do more for comfort than any heater swap.
⚠️ Common Mistakes to Avoid
🌿 Running storage heaters without a night tariff: the single most expensive mistake in Irish electric heating - check your tariff today.
🌿 Max input all winter: charging for -2°C on a 12°C night wastes euros nightly - set input to the forecast.
🌿 Output open all night: heat dumped into empty rooms at 3am is heat missing at 7pm.
🌿 "Topping up" with plug-in heaters at day rates: the symptom of wrong settings - and the bill-killer.
🌿 Replacing like-for-like without checking the heat pump maths: €12,500 in grants changes the answer for many houses - run it before buying new bricks.
❓ Frequently Asked Questions
🔹 Are storage heaters expensive to run in Ireland?
On a night-rate tariff with correct settings, they are moderate: €1.30-€2.40 per heater per night in winter. On a standard 24-hour tariff they are the dearest heating in the country - the tariff is everything.
🔹 Are new storage heaters worth it?
Modern high-heat-retention models genuinely improve on old units (thermostats, fans, ~45% better retention) and suit apartments well. For houses, compare against a grant-aided heat pump first.
🔹 Is there a grant for storage heaters?
No - the SEAI does not grant-aid new storage heaters. But replacing storage heating with a heat pump qualifies for the €4,000 Renewable Heat Bonus on top of the €6,500 pump grant.
🔹 What is the cheapest way to use storage heaters?
Night-rate tariff + input set to the weather + output closed until needed + no daytime plug-in top-ups. Those four habits are worth hundreds of euro a winter.
🔹 Should I replace storage heaters with a heat pump?
If you own a reasonably insulatable house, usually yes - up to €12,500 in grants and 3-4× the heat per kWh. In apartments, modern HHR heaters on a smart tariff are often the practical ceiling.
🔹 Why is my storage heater cold by evening?
Output was open too early, input too low for the weather, or the unit is an old model with poor retention - in that order of likelihood. Fix the dials before the heater.
📚 Related Guides
🌿 Heat Pumps
🌿 Air-to-Water Heat Pump Cost
🌿 Air-to-Air Heat Pumps
🌿 Heating Oil Prices
🌿 Heating Oil by County
🌿 HVO Fuel
🌿 Boiler Replacement Cost
🌿 Gas Boiler Service
🌿 Underfloor Heating
👉 All guides and calculators
Climate Jargon Buster is an independent resource providing plain-English information on climate, energy and sustainability topics for an Irish audience. Running costs are indicative, based on typical 2026 tariff ranges, and vary by home and supplier; grant amounts are correct as of August 2026 and are set by the SEAI. For official grant terms, visit seai.ie. This site is not affiliated with SEAI - always check the official website for current figures.