💡 Hot water cylinders work hardest alongside a heat pump — the cylinder stores the heat pump's output for domestic hot water, cutting fossil fuel use to near zero. SEAI grants of up to €1,600 available for hot water cylinders. Apply at seai.ie →
Grant Engineering · Heat Pump Indirect · Ireland 2026
Grant Engineering Vortex Eco Indirect HP 180L — Ireland 2026
Ireland's own cylinder — factory-matched to Grant Aerona4 heat pump
Manufactured by Grant Engineering in Birr, Co. Offaly — the same company that makes the Aerona4 heat pump. The Vortex Eco is factory-tested and matched as a complete system with the Aerona4, ensuring optimal compatibility and the simplest warranty claim process. For homeowners installing a Grant heat pump, specifying the Vortex Eco cylinder means both the heat pump and cylinder are covered under a single Grant system warranty. The 2.8 m² primary coil is sized for the Aerona4's flow temperatures, and Grant's hybrid mode (Aerona4 + existing Grant boiler) is supported with the higher 80°C max primary temperature.
180L2.8m² HP coil25-yr warrantyCopperVented🇮🇪 Made in IrelandSEAI: part of HP grant
⚙️ Specifications
Capacity
180 litres
Primary (HP) coil area
2.8 m²
Cylinder type
Vented (gravity-fed cold tank)
Inner material
Copper
Insulation thickness
80 mm
Standing heat loss
1.22 kWh/24h
Max primary temp
80°C
Immersion heaters
2 × 3 kW
Dimensions (H × Ø)
1400 × 545 mm
Weight (empty)
42 kg
Warranty
25 years
Made in Ireland
✅ Yes — Irish manufactured
💰 Pricing & SEAI grant
Cylinder supply price
~€680
Plus installation labour ~€400–€700 · Total installed ~€1,230
💰 Covered by SEAI Heat Pump System Grant (3 Feb 2026)
The cylinder is included as part of your overall heat pump installation cost. The SEAI grant covers the total installed system cost — heat pump, cylinder, controls, pipework and labour — up to:
① Heat Pump Equipment Grant€6,500
② Central Heating Upgrade (inc. cylinder)€2,000
③ Renewable Heat Bonus (fossil fuel switch)€4,000
Maximum total grant€12,500
Apply at seai.ie — receive Letter of Offer before installation begins. BER assessment required (€200 SEAI grant). Homes built before 2007 need Technical Assessment (€200). Installer must be SEAI-registered.
Key highlights
🔗
Factory-matched to Grant Aerona4
Grant engineers designed this cylinder alongside the Aerona4 heat pump — coil sizing, flow rates and temperature profiles are optimised for the Aerona4's specific operating range. Single Grant system warranty means one call if anything needs attention
🇮🇪
Both made in Ireland — Birr, Co. Offaly
The Aerona4 heat pump and the Vortex Eco cylinder are both manufactured by Grant Engineering in Birr. For homeowners who want a fully Irish-manufactured heating system, this is the only complete air-to-water heat pump + cylinder combination made in Ireland
🔀
Hybrid mode ready
Supports Grant's hybrid configuration — the Aerona4 handles most heating; your existing Grant oil boiler provides supplemental heat in very cold weather at up to 80°C primary temperature. One cylinder, two heat sources, intelligent control
🏠 Suitable for
Grant heat pump systemsRural IrelandRetrofitNew buildHybrid heat pump + boiler
Installation note: Vented cylinders require a cold water storage tank (usually in the loft) feeding by gravity. If your home doesn't have a loft tank, discuss with your plumber whether a vented or unvented cylinder is more appropriate for your installation.
✅ What we like
Factory-matched to Grant Aerona4 — single system warranty, simplest installation
Made in Birr, Co. Offaly — Irish manufacturing by the heat pump maker
Hybrid-ready: works with Grant Vortex oil boiler in hybrid mode at 80°C max
600+ Grant installer network — easiest to source and install nationwide
25-year warranty
80mm insulation — good standing heat loss performance
⚠️ Worth knowing
2.8 m² coil — slightly smaller than Range Tribune HE (3.35 m²) or Joule Cyclone (3.1 m²)
180L — may be undersized for families of 5+ with high hot water demand
Primarily recommended with Grant heat pumps — less commonly specified with other brands
🌡️ Compatible heat pump brands
The Vortex Eco Indirect HP 180L is compatible with all major air-to-water heat pump brands and is factory-recommended or shipped with Grant Aerona4. See the Heat Pump Directory for full specifications, pricing and SEAI grant details on all 19 heat pumps available in Ireland.
Grant Aerona4DaikinSamsungMitsubishi ElectricWorcester Bosch
❓ Questions about the Vortex Eco Indirect HP 180L
The Grant Engineering Vortex Eco Indirect HP 180L cylinder itself costs approximately ~€680. Installation (remove existing cylinder, connect to heat pump primary circuit, commission immersion backup) adds approximately €400–€700. Total installed cost: typically ~€1,230. This is usually included in the overall heat pump installation quote from your SEAI-registered installer — ask for the cylinder to be itemised on the quote so you can compare against other brands.
In most cases, no — your existing cylinder should be replaced as part of the heat pump installation. Standard cylinders have small primary coils (1.5–2.0 m²) designed for boiler temperatures of 70–80°C. Heat pumps deliver water at 45–55°C and need a much larger coil (typically 2.8–3.4 m²) to transfer adequate heat at the lower temperature. The Grant Engineering Vortex Eco Indirect HP 180L has a 2.8 m² primary coil — specifically sized for heat pump low-temperature operation. Using a standard cylinder with a heat pump results in slow reheat, inefficient operation, and higher running costs.
Yes — the cylinder cost is included within the SEAI Heat Pump System Grant (up to €12,500 for houses switching from fossil fuel heating, from 3 February 2026). The grant is applied to the total installed system cost including heat pump, cylinder, controls, pipework and labour — not as a separate per-component payment. Cylinders are not individually grant-funded as standalone items. A BER assessment is required before the grant can be drawn down, and all work must be carried out by a SEAI-registered contractor. The Grant Engineering Vortex Eco Indirect HP 180L's ~€680 cylinder cost contributes toward the Central Heating Upgrade element of the grant (up to €2,000).
A heat pump cylinder is typically set to 55–60°C to balance legionella risk with heat pump efficiency. Legionella bacteria cannot survive above 60°C. Most heat pump systems include a weekly legionella protection cycle where the immersion heater in the Grant Engineering Vortex Eco Indirect HP 180L raises the full cylinder to 60–70°C. Day-to-day, the heat pump heats the cylinder to the setpoint temperature (often 50–55°C) — a heat pump's COP drops significantly above 55°C. The Grant Engineering Vortex Eco Indirect HP 180L's max primary temperature of 80°C accommodates both routine heat pump operation and legionella protection cycles. Your installer will configure the legionella cycle as part of commissioning.
The Grant Engineering Vortex Eco Indirect HP 180L at 180L is suited to 2–3 person households or properties with limited airing cupboard space. A heat pump heats the cylinder slowly over 2–4 hours (compared to a boiler's rapid reheat) — so the system is usually programmed to heat the cylinder once or twice daily, storing enough hot water for the day's demand. General guideline: allow 40–50 litres per person per day. For a 4-person household with a heat pump: 160–200L minimum. Homes with high shower use or a bath should consider 200–250L.
Copper is the most widely used material for hot water cylinders in Ireland and works perfectly well in most locations. The Grant Engineering Vortex Eco Indirect HP 180L's copper inner is fully compatible with heat pump operation at 45–60°C. Copper becomes less ideal in two situations: hard water areas (Dublin, Kildare, Meath — calcium deposits accelerate internal corrosion over 15–20 years) and coastal properties within 5–10km of the sea (salt air degrades exposed copper fittings). For soft water areas and inland properties, copper is the most cost-effective choice. For hard water or coastal areas, consider the Kingspan Albion Ultrasteel (duplex stainless) or Telford Tempest (stainless 304) instead.
Grant Engineering manufacturing in Ireland means parts, warranty support and replacement components are held locally — not shipped from overseas depots with 2–4 week lead times. For a heat pump system that is your primary heating source, a warranty claim requiring a new cylinder should not leave your home without hot water for weeks. Irish-manufactured cylinders also mean shorter supply chains, typically lower logistics-related carbon, and supporting Irish employment. The 25-year warranty on the Grant Engineering Vortex Eco Indirect HP 180L is backed by a local manufacturer — not a foreign subsidiary — giving greater confidence in long-term warranty support.
Heat transfer through a coil depends on temperature difference (ΔT), flow rate, and coil surface area. In a boiler system, ΔT is large (boiler at 75°C, cylinder at 55°C → ΔT = 20°C) — even a small coil transfers heat quickly. In a heat pump system, ΔT is small (HP at 50°C, cylinder at 45°C → ΔT = 5°C). With a small ΔT, you need a much larger coil surface area to transfer the same heat. The Grant Engineering Vortex Eco Indirect HP 180L's 2.8 m² primary coil compensates for the low temperature differential, allowing the heat pump to operate at lower, more efficient flow temperatures without sacrificing reheat time. Standard boiler cylinders typically have only 1.5–2.0 m² coils — using one with a heat pump results in slow reheat and the heat pump working harder and less efficiently.
No — the Aerona4 heat pump is compatible with any correctly sized heat pump cylinder from Joule, Range, Kingspan or other brands. However, Grant recommends the Vortex Eco because it has been factory-tested with the Aerona4, the coil sizing is optimised for the Aerona4's exact flow temperatures, and — most importantly — both products are covered under a single Grant system warranty. Using a third-party cylinder doesn't void the heat pump warranty, but it means you have two separate warranties to manage if a problem arises.
Yes — the Vortex Eco is a standard indirect heat pump cylinder compatible with any air-to-water heat pump that delivers water at up to 80°C primary flow temperature. It works with Daikin Altherma, Mitsubishi Ecodan, Samsung EHS, and Worcester Bosch Greenstar. Its 2.8 m² coil is adequate for heat pumps up to approximately 10 kW heating capacity.
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Find SEAI-registered heat pump installers for the Grant Engineering Vortex Eco Indirect HP 180L
Your installer will supply and install both the heat pump and the Grant Engineering cylinder as a complete SEAI-eligible system. Tell us what combination you need — we match you with up to 3 SEAI-registered installers in your area. Free and no obligation.
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Up to 3 SEAI-registered installers in your area will contact you within 1 business day with system recommendations and pricing — including the Grant Engineering Vortex Eco Indirect HP 180L cylinder.
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The Grant Engineering Vortex Eco Indirect HP 180L is designed to work with the following heat pumps, solar diverters and smart energy products from our Irish directories. It is supplied as standard with Grant Aerona4 installations.
Solar diverters — use surplus solar for free hot water
This cylinder has an immersion heater — which means it can receive free hot water from surplus solar. A solar diverter intercepts solar surplus before it exports to the grid and redirects it straight to your immersion, typically providing 60–80% of annual hot water from the sun. Payback is usually under 18 months.
A 4kWp solar system generates approximately 3,600 kWh/year in Ireland. With a solar diverter redirecting surplus to this cylinder's immersion heater, you can cover 60–80% of annual hot water energy for free — on top of the heat pump doing the heavy lifting.
EV charger + home battery — run everything on solar
Your heat pump and this cylinder provide low-carbon heating and hot water. Add solar panels, a home battery and an EV charger and you can power your car, your heating and your hot water from the same roof — the combined SEAI grants available reach up to €14,600.
A hot water cylinder upgrade is often the first step in a wider home energy transformation. With a solar diverter filling your cylinder for free during the day, the next natural step is an EV — charged overnight on cheap night-rate electricity or from surplus solar. See all 205+ EVs in the EV Vehicle Directory.
💧 Solar hot water + EV: your whole home running on free energy
☀️ Solar diverter
Free hot water
surplus solar → cylinder
🚗 Smart EV charger
Free driving
surplus solar → your EV
💶 Combined saving
~€3,000/yr
hot water + fuel combined
A myenergi Eddi fills your cylinder with free solar. A myenergi Zappi in Eco+ mode fills your EV with whatever solar is left — both share generation data via the Hub so they never compete. View myenergi Eddi →
