💡 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 →
Telford · Heat Pump Indirect · Ireland 2026
Telford Tempest HP Stainless 200L — Ireland 2026
Stainless steel heat pump cylinder — factory-approved by Mitsubishi Ecodan
The Telford Tempest HP is factory-approved and frequently specified by Mitsubishi Electric Ireland for Ecodan heat pump installations. Its 3.4 m² primary coil is one of the largest available in a stainless steel cylinder — delivering fast reheat at Ecodan's typical flow temperatures of 45–55°C. Stainless steel inner provides hard water and coastal corrosion resistance at a lower price premium than the Kingspan Albion duplex stainless. The Tempest HP is the go-to specification for Mitsubishi Ecodan installers throughout Ireland.
200L3.4m² HP coil25-yr warrantyStainless steelVentedSEAI: part of HP grant
⚙️ Specifications
Capacity
200 litres
Primary (HP) coil area
3.4 m²
Cylinder type
Vented (gravity-fed cold tank)
Inner material
Stainless steel (304)
Insulation thickness
80 mm
Standing heat loss
1.2 kWh/24h
Max primary temp
80°C
Immersion heaters
2 × 3 kW
Dimensions (H × Ø)
1520 × 545 mm
Weight (empty)
40 kg
Warranty
25 years
Made in Ireland
No
💰 Pricing & SEAI grant
Cylinder supply price
~€780
Plus installation labour ~€400–€700 · Total installed ~€1,330
💰 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
✅
Mitsubishi Ecodan approved
Mitsubishi Electric Ireland specifically recommends the Tempest HP for Ecodan installations — it has been tested and approved for compatibility with Ecodan flow rates, temperatures and pressure characteristics
⚡
3.4 m² coil — fastest stainless reheat
The largest primary coil of any stainless cylinder in this directory — matching or exceeding copper alternatives for heat transfer at heat pump temperatures while adding corrosion resistance
💧
Stainless steel — hard water and coastal resistance
Standard 304 stainless provides meaningful protection against hard water pitting compared to copper. For most Irish locations, this is adequate; for coastal areas with heavy salt air, duplex stainless (Kingspan Albion) is a better specification
🏠 Suitable for
Heat pumpHard water areasNew buildPremium retrofitMitsubishi Ecodan installations
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-approved by Mitsubishi Electric for Ecodan heat pump installations
3.4 m² primary coil — largest of any stainless cylinder in this directory
Stainless steel inner — corrosion-resistant for hard water and coastal areas
25-year warranty
80mm insulation — good standing heat loss (1.20 kWh/24h)
Available through established Mitsubishi Ecodan installer network in Ireland
⚠️ Worth knowing
Not manufactured in Ireland — UK production
Standard 304 stainless (not duplex) — less corrosion-resistant than Kingspan Albion in chloride-heavy coastal areas
Higher price than copper alternatives of similar capacity
🌡️ Compatible heat pump brands
The Tempest HP Stainless 200L is compatible with all major air-to-water heat pump brands and is factory-recommended or shipped with Mitsubishi Electric Ecodan (recommended pairing). See the Heat Pump Directory for full specifications, pricing and SEAI grant details on all 19 heat pumps available in Ireland.
Mitsubishi Electric EcodanDaikinSamsungVaillantNibePanasonic
❓ Questions about the Tempest HP Stainless 200L
The Telford Tempest HP Stainless 200L cylinder itself costs approximately ~€780. Installation (remove existing cylinder, connect to heat pump primary circuit, commission immersion backup) adds approximately €400–€700. Total installed cost: typically ~€1,330. 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 Telford Tempest HP Stainless 200L has a 3.4 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 Telford Tempest HP Stainless 200L's ~€780 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 Telford Tempest HP Stainless 200L 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 Telford Tempest HP Stainless 200L'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 Telford Tempest HP Stainless 200L at 200L is suited to a typical 3–4 bedroom family home. 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.
For hard water areas (Dublin, Kildare, Meath, parts of Munster) and coastal locations within 10km of the sea, yes — stainless steel is worth the premium. Copper cylinders in high-hardness water areas frequently develop pinhole corrosion after 15–20 years. The Telford Tempest HP Stainless 200L's stainless steel inner resists hard water pitting and coastal salt air corrosion. The cost premium over a comparable copper cylinder is typically €120–180 — which is easily offset by avoiding a cylinder replacement at €800–1,200 installed. For soft water areas (Connacht west coast, most of Donegal), copper is perfectly adequate and the saving is a reasonable decision.
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 Telford Tempest HP Stainless 200L's 3.4 m² primary coil — one of the largest available — 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 — it's compatible with any air-to-water heat pump. Mitsubishi Electric approves it specifically for Ecodan, which is why Irish Ecodan installers default to it. But its 3.4 m² primary coil and 80°C max primary temperature make it equally suitable for Daikin Altherma, Samsung EHS, Vaillant aroTHERM, Nibe and Panasonic Aquarea installations. If your installer has a strong Mitsubishi Ecodan background, the Tempest HP is likely already their default cylinder specification.
Both are excellent heat pump cylinders. Key differences: Telford Tempest is stainless steel (better for hard water and coastal areas), has a larger 3.4 m² coil (vs 3.1 m²), but costs ~€130 more. Joule Cyclone is copper, Irish-made in Waterford, slightly cheaper, and more widely stocked by general plumbing merchants. If you're in a hard water area or within 10km of the coast, the Telford Tempest's stainless advantage is worth the premium. For soft water inland areas, the Joule Cyclone is the more economical and equally effective choice.
Get it installed
Find SEAI-registered heat pump installers for the Telford Tempest HP Stainless 200L
Your installer will supply and install both the heat pump and the Telford 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.
💧 Get heat pump + cylinder quotes
Up to 3 SEAI-registered installers in your area will contact you within 1 business day with system recommendations and pricing — including the Telford Tempest HP Stainless 200L cylinder.
💶 Get quotes
3 local installers · 1 business day
💬 Get advice first
Free assessment · no obligation
Your details are only shared with SEAI-registered Irish heat pump installers. No spam — ever.
✅
Request sent!
We're matching you with up to 3 SEAI-registered heat pump installers in your area who supply the Telford cylinder. Expect contact within 1 business day.
De Energy Hub
More power to youTM.
🚗 Built for EV fleet operators & leasing companies
Manage your entire charging fleet — across sites, with energy rate control
Fleet operators can manage charging across multiple sites through a single app. Assign Pure Energy chargers for green-fleet reporting, Smart Energy for cost efficiency, or Boost Energy for fast overnight turnaround. Drivers see live energy rates before booking.
☀️ Pure Energy🔄 Smart Energy🚀 Boost Energy
🚐
Vehicle category routing
Car, Minibus, Van, Truck — drivers filtered to chargers rated for their vehicle class
⚡
Energy rate per charger
Assign Pure, Smart or Boost Energy per charger — green fleet compliance tracking built in
🔑
Self & guest bookings
Fleet managers book for drivers who don't have the app — drivers notified and guided through check-in
The Telford Tempest HP Stainless 200L 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 Mitsubishi Electric Ecodan (recommended pairing) 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 →
