Heatrae Sadia Megaflo Eco Indirect Unvented Hot Water Cylinder – 70i / 125i / 145i / 170i / 210i / 250i / 300i
Heatrae Sadia Megaflo Eco Indirect Unvented Hot Water Cylinder – 70i / 125i / 145i / 170i / 210i / 250i / 300i
The Heatrae Sadia Megaflo Eco Indirect is the UK's market-leading indirectly heated unvented hot water cylinder — designed to be fed by a gas, oil, or heat-pump boiler as the primary heat source, with a single 3 kW backup immersion heater for off-peak or emergency use. Built in the UK from high-grade duplex stainless steel, the Megaflo Eco Indirect features a unique coil-in-coil heat exchanger for exceptionally fast recovery, internal expansion (no external vessel required), and delivers mains-pressure hot water at up to 76 litres per minute — with a lifetime guarantee on the inner tank.
Megaflo Eco Indirect cylinders must be installed and commissioned by a G3 competent person (or equivalent under Scottish / Northern Irish Building Regulations). All electrical connections must be made by a qualified electrician in line with current IET Wiring Regulations. The Benchmark commissioning checklist must be completed and left with the householder.
These cylinders are heated primarily by your gas, oil, or heat-pump boiler via the internal coil. A single 3 kW backup immersion heater is included for off-peak electricity tariffs or when the boiler is unavailable. They are not suitable for use with solid-fuel boilers or gravity-circulation primaries unless additional safety measures are fitted. If you need electric-only heating, please see our Megaflo Eco Direct range.
The Megaflo Eco Indirect's unique coil-in-coil heat exchanger maximises contact surface area between the primary circuit and stored water, delivering exceptionally fast heat-up and recovery times — as quick as 17 minutes for the 70i at 15 l/min primary flow — without the need for a high-volume boiler output.
An internal floating-baffle air-gap system accommodates all domestic hot water expansion within the cylinder itself. No external expansion vessel is required for the DHW circuit, reducing pipework complexity and saving installation space — note that the primary heating circuit will still require its own expansion vessel if running a sealed system.
Every Megaflo Eco Indirect is fabricated from high-grade duplex stainless steel, pressure-tested to 15 bar. The alloy combines superior corrosion resistance with a high strength-to-weight ratio — the basis for Heatrae Sadia's lifetime guarantee on the inner tank in domestic installations.
Fed directly from the cold-water mains, the Megaflo Eco Indirect delivers up to 76 litres per minute at 3 bar and 45 litres per minute at 1 bar — providing powerful, simultaneous hot water to multiple outlets without shower pumps or loft tanks. Consistent pressure on both hot and cold services is ideal for thermostatic shower valves.
60 mm of fire-retardant polyurethane foam (zero ozone depletion, GWP = 3.1) with an insulated T&P valve delivers excellent standing heat-loss performance — from 0.91 kWh/24 h (70i) to 1.69 kWh/24 h (300i) — exceeding Building Regulations Part L requirements across the range.
A factory-fitted single 3 kW Incoloy 825 alloy-sheathed immersion heater with manual-reset thermal cut-out provides electric backup. The cylinder ships complete with an additional thermostat and thermal cut-out, 22 mm 2-port motorised valve, and wiring centre — fully pre-wired and ready for connection to a system or heat-only boiler.
Every model includes a complete cold-water inlet control kit (3 bar PRV · 8 bar pressure relief valve · ¼-turn isolator · line strainer · non-return valve · drain cock), a factory-fitted 90 °C / 10 bar T&P relief valve, tundish, and T&P insulation kit — plus a ½" BSP secondary return tapping (125i and above) for systems requiring circulation.
The Megaflo Eco Indirect range achieves an ErP Energy Efficiency Class B (70i–210i) or Class C (250i–300i), complies with Building Regulations Parts G and L, and holds Kiwa certification No. 1608707. The range is manufactured under BS EN ISO 9001, ISO 14001, ISO 50001, and OHSAS 18001 quality standards.
- Factory-fitted Incoloy 825 alloy single 3 kW immersion heater with thermal controls and manual-reset cut-out
- Cold Water Inlet Control Kit: 3 bar PRV · 8 bar pressure relief valve · ¼-turn isolating valve · line strainer · non-return valve · drain cock with hose connector · nuts and olives
- Factory-fitted T&P relief valve set at 90 °C / 10 bar (BS EN 1490)
- T&P valve insulation kit
- 15/22 mm tundish
- Additional thermostat and thermal cut-out (indirect circuit)
- Wiring centre
- 22 mm 2-port motorised valve
Optional upgrade: Titanium Indirect Control Assembly and Immersion Heater (part 95 970 554) — for aggressive or hard water areas.
| Parameter | Value / Specification |
|---|---|
| Inner vessel material | High-grade duplex stainless steel — pressure tested to 15 bar |
| Thermal insulation | 60 mm CFC/HCFC-free fire-retardant polyurethane foam (GWP = 3.1) |
| Operating pressure (DHW) | 0.3 MPa (3 bar) |
| Max incoming mains pressure (to PRV) | 1.6 MPa (16 bar) |
| Min recommended supply pressure / flow | 0.15 MPa (1.5 bar) — 20 litres/min |
| Pressure relief valve | 0.8 MPa (8 bar) |
| T&P relief valve setting | 90 °C / 1 MPa (10 bar) |
| Immersion heater (backup) | Single 3 kW @ 240 V / 2.8 kW @ 230 V (AC only) — Incoloy 825 alloy sheathed |
| DHW connections | 22 mm compression / ¾" BSP male |
| Secondary return connection | ½" BSP female (125i and above) |
| Thermostat setting (factory) | 60 °C |
| Diameter (all models) | 579 mm (Ø) |
| Outer casing | White textured plastic-coated corrosion-resistant steel |
| Kiwa certification | No. 1608707 |
| Tank guarantee | Lifetime (inner tank) · 2 years (components) |
| Country of manufacture | United Kingdom |
| Model | 70i | 125i | 145i | 170i | 210i | 250i | 300i |
|---|---|---|---|---|---|---|---|
| Product code | 95050461 | 95050463 | 95050465 | 95050467 | 95050469 | 95050472 | 95050475 |
| Nominal capacity (L) | 70 | 125 | 145 | 170 | 210 | 250 | 300 |
| Immersion heater (kW) | 1 × 3 | 1 × 3 | 1 × 3 | 1 × 3 | 1 × 3 | 1 × 3 | 1 × 3 |
| ErP class | B | B | B | B | B | C | C |
| Storage volume @ 3 bar (L) | 92 | 137 | 155 | 178 | 195 | 233 | 283 |
| Max flow at 3 bar (L/min) | 76 | 76 | 76 | 76 | 76 | 76 | 76 |
| Coil heat-up time at 15 l/min 80 °C (min) | 17 | 23 | 24 | 22 | 28 | 34 | 39 |
| Recovery 70% draw-off (min) | 10 | 15 | 17 | 16 | 19 | 23 | 27 |
| Standing heat loss (kWh/24 h) | 0.91 | 1.05 | 1.18 | 1.20 | 1.42 | 1.61 | 1.69 |
| Standing heat loss (kWh/year) | 332 | 383 | 430 | 438 | 518 | 588 | 617 |
| Standing loss (W) | 38 | 44 | 49 | 50 | 59 | 67 | 70 |
| Weight empty (kg) | 25 | 31 | 35 | 39 | 43 | 50 | 58 |
| Weight full (kg) | 125 | 180 | 204 | 233 | 253 | 300 | 358 |
| Dimension | 70i | 125i | 145i | 170i | 210i | 250i | 300i |
|---|---|---|---|---|---|---|---|
| A — DHW inlet | 414 | 414 | 414 | 414 | 414 | 414 | 414 |
| B — Primary coil connections | 373 | 373 | 373 | 373 | 373 | 373 | 373 |
| C — Secondary return | — | 709 | 810 | 934 | 1011 | 1238 | 1526 |
| D — T&P relief valve | 495 | 794 | 895 | 1020 | 1095 | 1323 | 1574 |
| E — Height | 802 | 1102 | 1229 | 1384 | 1486 | 1738 | 2053 |
| F — Depth (footprint) | 600 | 600 | 600 | 600 | 600 | 600 | 600 |
| G — Width (Ø) | 579 | 579 | 579 | 579 | 579 | 579 | 579 |
| H — Sensor pocket | 410 | 410 | 410 | 410 | 410 | 410 | 410 |
| I — Cable entry lower | 275 | 275 | 275 | 275 | 275 | 275 | 275 |
Original: $1,850.40
-65%$1,850.40
$647.64More Images
Heatrae Sadia Megaflo Eco Indirect Unvented Hot Water Cylinder – 70i / 125i / 145i / 170i / 210i / 250i / 300i
The Heatrae Sadia Megaflo Eco Indirect is the UK's market-leading indirectly heated unvented hot water cylinder — designed to be fed by a gas, oil, or heat-pump boiler as the primary heat source, with a single 3 kW backup immersion heater for off-peak or emergency use. Built in the UK from high-grade duplex stainless steel, the Megaflo Eco Indirect features a unique coil-in-coil heat exchanger for exceptionally fast recovery, internal expansion (no external vessel required), and delivers mains-pressure hot water at up to 76 litres per minute — with a lifetime guarantee on the inner tank.
Megaflo Eco Indirect cylinders must be installed and commissioned by a G3 competent person (or equivalent under Scottish / Northern Irish Building Regulations). All electrical connections must be made by a qualified electrician in line with current IET Wiring Regulations. The Benchmark commissioning checklist must be completed and left with the householder.
These cylinders are heated primarily by your gas, oil, or heat-pump boiler via the internal coil. A single 3 kW backup immersion heater is included for off-peak electricity tariffs or when the boiler is unavailable. They are not suitable for use with solid-fuel boilers or gravity-circulation primaries unless additional safety measures are fitted. If you need electric-only heating, please see our Megaflo Eco Direct range.
The Megaflo Eco Indirect's unique coil-in-coil heat exchanger maximises contact surface area between the primary circuit and stored water, delivering exceptionally fast heat-up and recovery times — as quick as 17 minutes for the 70i at 15 l/min primary flow — without the need for a high-volume boiler output.
An internal floating-baffle air-gap system accommodates all domestic hot water expansion within the cylinder itself. No external expansion vessel is required for the DHW circuit, reducing pipework complexity and saving installation space — note that the primary heating circuit will still require its own expansion vessel if running a sealed system.
Every Megaflo Eco Indirect is fabricated from high-grade duplex stainless steel, pressure-tested to 15 bar. The alloy combines superior corrosion resistance with a high strength-to-weight ratio — the basis for Heatrae Sadia's lifetime guarantee on the inner tank in domestic installations.
Fed directly from the cold-water mains, the Megaflo Eco Indirect delivers up to 76 litres per minute at 3 bar and 45 litres per minute at 1 bar — providing powerful, simultaneous hot water to multiple outlets without shower pumps or loft tanks. Consistent pressure on both hot and cold services is ideal for thermostatic shower valves.
60 mm of fire-retardant polyurethane foam (zero ozone depletion, GWP = 3.1) with an insulated T&P valve delivers excellent standing heat-loss performance — from 0.91 kWh/24 h (70i) to 1.69 kWh/24 h (300i) — exceeding Building Regulations Part L requirements across the range.
A factory-fitted single 3 kW Incoloy 825 alloy-sheathed immersion heater with manual-reset thermal cut-out provides electric backup. The cylinder ships complete with an additional thermostat and thermal cut-out, 22 mm 2-port motorised valve, and wiring centre — fully pre-wired and ready for connection to a system or heat-only boiler.
Every model includes a complete cold-water inlet control kit (3 bar PRV · 8 bar pressure relief valve · ¼-turn isolator · line strainer · non-return valve · drain cock), a factory-fitted 90 °C / 10 bar T&P relief valve, tundish, and T&P insulation kit — plus a ½" BSP secondary return tapping (125i and above) for systems requiring circulation.
The Megaflo Eco Indirect range achieves an ErP Energy Efficiency Class B (70i–210i) or Class C (250i–300i), complies with Building Regulations Parts G and L, and holds Kiwa certification No. 1608707. The range is manufactured under BS EN ISO 9001, ISO 14001, ISO 50001, and OHSAS 18001 quality standards.
- Factory-fitted Incoloy 825 alloy single 3 kW immersion heater with thermal controls and manual-reset cut-out
- Cold Water Inlet Control Kit: 3 bar PRV · 8 bar pressure relief valve · ¼-turn isolating valve · line strainer · non-return valve · drain cock with hose connector · nuts and olives
- Factory-fitted T&P relief valve set at 90 °C / 10 bar (BS EN 1490)
- T&P valve insulation kit
- 15/22 mm tundish
- Additional thermostat and thermal cut-out (indirect circuit)
- Wiring centre
- 22 mm 2-port motorised valve
Optional upgrade: Titanium Indirect Control Assembly and Immersion Heater (part 95 970 554) — for aggressive or hard water areas.
| Parameter | Value / Specification |
|---|---|
| Inner vessel material | High-grade duplex stainless steel — pressure tested to 15 bar |
| Thermal insulation | 60 mm CFC/HCFC-free fire-retardant polyurethane foam (GWP = 3.1) |
| Operating pressure (DHW) | 0.3 MPa (3 bar) |
| Max incoming mains pressure (to PRV) | 1.6 MPa (16 bar) |
| Min recommended supply pressure / flow | 0.15 MPa (1.5 bar) — 20 litres/min |
| Pressure relief valve | 0.8 MPa (8 bar) |
| T&P relief valve setting | 90 °C / 1 MPa (10 bar) |
| Immersion heater (backup) | Single 3 kW @ 240 V / 2.8 kW @ 230 V (AC only) — Incoloy 825 alloy sheathed |
| DHW connections | 22 mm compression / ¾" BSP male |
| Secondary return connection | ½" BSP female (125i and above) |
| Thermostat setting (factory) | 60 °C |
| Diameter (all models) | 579 mm (Ø) |
| Outer casing | White textured plastic-coated corrosion-resistant steel |
| Kiwa certification | No. 1608707 |
| Tank guarantee | Lifetime (inner tank) · 2 years (components) |
| Country of manufacture | United Kingdom |
| Model | 70i | 125i | 145i | 170i | 210i | 250i | 300i |
|---|---|---|---|---|---|---|---|
| Product code | 95050461 | 95050463 | 95050465 | 95050467 | 95050469 | 95050472 | 95050475 |
| Nominal capacity (L) | 70 | 125 | 145 | 170 | 210 | 250 | 300 |
| Immersion heater (kW) | 1 × 3 | 1 × 3 | 1 × 3 | 1 × 3 | 1 × 3 | 1 × 3 | 1 × 3 |
| ErP class | B | B | B | B | B | C | C |
| Storage volume @ 3 bar (L) | 92 | 137 | 155 | 178 | 195 | 233 | 283 |
| Max flow at 3 bar (L/min) | 76 | 76 | 76 | 76 | 76 | 76 | 76 |
| Coil heat-up time at 15 l/min 80 °C (min) | 17 | 23 | 24 | 22 | 28 | 34 | 39 |
| Recovery 70% draw-off (min) | 10 | 15 | 17 | 16 | 19 | 23 | 27 |
| Standing heat loss (kWh/24 h) | 0.91 | 1.05 | 1.18 | 1.20 | 1.42 | 1.61 | 1.69 |
| Standing heat loss (kWh/year) | 332 | 383 | 430 | 438 | 518 | 588 | 617 |
| Standing loss (W) | 38 | 44 | 49 | 50 | 59 | 67 | 70 |
| Weight empty (kg) | 25 | 31 | 35 | 39 | 43 | 50 | 58 |
| Weight full (kg) | 125 | 180 | 204 | 233 | 253 | 300 | 358 |
| Dimension | 70i | 125i | 145i | 170i | 210i | 250i | 300i |
|---|---|---|---|---|---|---|---|
| A — DHW inlet | 414 | 414 | 414 | 414 | 414 | 414 | 414 |
| B — Primary coil connections | 373 | 373 | 373 | 373 | 373 | 373 | 373 |
| C — Secondary return | — | 709 | 810 | 934 | 1011 | 1238 | 1526 |
| D — T&P relief valve | 495 | 794 | 895 | 1020 | 1095 | 1323 | 1574 |
| E — Height | 802 | 1102 | 1229 | 1384 | 1486 | 1738 | 2053 |
| F — Depth (footprint) | 600 | 600 | 600 | 600 | 600 | 600 | 600 |
| G — Width (Ø) | 579 | 579 | 579 | 579 | 579 | 579 | 579 |
| H — Sensor pocket | 410 | 410 | 410 | 410 | 410 | 410 | 410 |
| I — Cable entry lower | 275 | 275 | 275 | 275 | 275 | 275 | 275 |
Product Information
Product Information
Shipping & Returns
Shipping & Returns
Description
The Heatrae Sadia Megaflo Eco Indirect is the UK's market-leading indirectly heated unvented hot water cylinder — designed to be fed by a gas, oil, or heat-pump boiler as the primary heat source, with a single 3 kW backup immersion heater for off-peak or emergency use. Built in the UK from high-grade duplex stainless steel, the Megaflo Eco Indirect features a unique coil-in-coil heat exchanger for exceptionally fast recovery, internal expansion (no external vessel required), and delivers mains-pressure hot water at up to 76 litres per minute — with a lifetime guarantee on the inner tank.
Megaflo Eco Indirect cylinders must be installed and commissioned by a G3 competent person (or equivalent under Scottish / Northern Irish Building Regulations). All electrical connections must be made by a qualified electrician in line with current IET Wiring Regulations. The Benchmark commissioning checklist must be completed and left with the householder.
These cylinders are heated primarily by your gas, oil, or heat-pump boiler via the internal coil. A single 3 kW backup immersion heater is included for off-peak electricity tariffs or when the boiler is unavailable. They are not suitable for use with solid-fuel boilers or gravity-circulation primaries unless additional safety measures are fitted. If you need electric-only heating, please see our Megaflo Eco Direct range.
The Megaflo Eco Indirect's unique coil-in-coil heat exchanger maximises contact surface area between the primary circuit and stored water, delivering exceptionally fast heat-up and recovery times — as quick as 17 minutes for the 70i at 15 l/min primary flow — without the need for a high-volume boiler output.
An internal floating-baffle air-gap system accommodates all domestic hot water expansion within the cylinder itself. No external expansion vessel is required for the DHW circuit, reducing pipework complexity and saving installation space — note that the primary heating circuit will still require its own expansion vessel if running a sealed system.
Every Megaflo Eco Indirect is fabricated from high-grade duplex stainless steel, pressure-tested to 15 bar. The alloy combines superior corrosion resistance with a high strength-to-weight ratio — the basis for Heatrae Sadia's lifetime guarantee on the inner tank in domestic installations.
Fed directly from the cold-water mains, the Megaflo Eco Indirect delivers up to 76 litres per minute at 3 bar and 45 litres per minute at 1 bar — providing powerful, simultaneous hot water to multiple outlets without shower pumps or loft tanks. Consistent pressure on both hot and cold services is ideal for thermostatic shower valves.
60 mm of fire-retardant polyurethane foam (zero ozone depletion, GWP = 3.1) with an insulated T&P valve delivers excellent standing heat-loss performance — from 0.91 kWh/24 h (70i) to 1.69 kWh/24 h (300i) — exceeding Building Regulations Part L requirements across the range.
A factory-fitted single 3 kW Incoloy 825 alloy-sheathed immersion heater with manual-reset thermal cut-out provides electric backup. The cylinder ships complete with an additional thermostat and thermal cut-out, 22 mm 2-port motorised valve, and wiring centre — fully pre-wired and ready for connection to a system or heat-only boiler.
Every model includes a complete cold-water inlet control kit (3 bar PRV · 8 bar pressure relief valve · ¼-turn isolator · line strainer · non-return valve · drain cock), a factory-fitted 90 °C / 10 bar T&P relief valve, tundish, and T&P insulation kit — plus a ½" BSP secondary return tapping (125i and above) for systems requiring circulation.
The Megaflo Eco Indirect range achieves an ErP Energy Efficiency Class B (70i–210i) or Class C (250i–300i), complies with Building Regulations Parts G and L, and holds Kiwa certification No. 1608707. The range is manufactured under BS EN ISO 9001, ISO 14001, ISO 50001, and OHSAS 18001 quality standards.
- Factory-fitted Incoloy 825 alloy single 3 kW immersion heater with thermal controls and manual-reset cut-out
- Cold Water Inlet Control Kit: 3 bar PRV · 8 bar pressure relief valve · ¼-turn isolating valve · line strainer · non-return valve · drain cock with hose connector · nuts and olives
- Factory-fitted T&P relief valve set at 90 °C / 10 bar (BS EN 1490)
- T&P valve insulation kit
- 15/22 mm tundish
- Additional thermostat and thermal cut-out (indirect circuit)
- Wiring centre
- 22 mm 2-port motorised valve
Optional upgrade: Titanium Indirect Control Assembly and Immersion Heater (part 95 970 554) — for aggressive or hard water areas.
| Parameter | Value / Specification |
|---|---|
| Inner vessel material | High-grade duplex stainless steel — pressure tested to 15 bar |
| Thermal insulation | 60 mm CFC/HCFC-free fire-retardant polyurethane foam (GWP = 3.1) |
| Operating pressure (DHW) | 0.3 MPa (3 bar) |
| Max incoming mains pressure (to PRV) | 1.6 MPa (16 bar) |
| Min recommended supply pressure / flow | 0.15 MPa (1.5 bar) — 20 litres/min |
| Pressure relief valve | 0.8 MPa (8 bar) |
| T&P relief valve setting | 90 °C / 1 MPa (10 bar) |
| Immersion heater (backup) | Single 3 kW @ 240 V / 2.8 kW @ 230 V (AC only) — Incoloy 825 alloy sheathed |
| DHW connections | 22 mm compression / ¾" BSP male |
| Secondary return connection | ½" BSP female (125i and above) |
| Thermostat setting (factory) | 60 °C |
| Diameter (all models) | 579 mm (Ø) |
| Outer casing | White textured plastic-coated corrosion-resistant steel |
| Kiwa certification | No. 1608707 |
| Tank guarantee | Lifetime (inner tank) · 2 years (components) |
| Country of manufacture | United Kingdom |
| Model | 70i | 125i | 145i | 170i | 210i | 250i | 300i |
|---|---|---|---|---|---|---|---|
| Product code | 95050461 | 95050463 | 95050465 | 95050467 | 95050469 | 95050472 | 95050475 |
| Nominal capacity (L) | 70 | 125 | 145 | 170 | 210 | 250 | 300 |
| Immersion heater (kW) | 1 × 3 | 1 × 3 | 1 × 3 | 1 × 3 | 1 × 3 | 1 × 3 | 1 × 3 |
| ErP class | B | B | B | B | B | C | C |
| Storage volume @ 3 bar (L) | 92 | 137 | 155 | 178 | 195 | 233 | 283 |
| Max flow at 3 bar (L/min) | 76 | 76 | 76 | 76 | 76 | 76 | 76 |
| Coil heat-up time at 15 l/min 80 °C (min) | 17 | 23 | 24 | 22 | 28 | 34 | 39 |
| Recovery 70% draw-off (min) | 10 | 15 | 17 | 16 | 19 | 23 | 27 |
| Standing heat loss (kWh/24 h) | 0.91 | 1.05 | 1.18 | 1.20 | 1.42 | 1.61 | 1.69 |
| Standing heat loss (kWh/year) | 332 | 383 | 430 | 438 | 518 | 588 | 617 |
| Standing loss (W) | 38 | 44 | 49 | 50 | 59 | 67 | 70 |
| Weight empty (kg) | 25 | 31 | 35 | 39 | 43 | 50 | 58 |
| Weight full (kg) | 125 | 180 | 204 | 233 | 253 | 300 | 358 |
| Dimension | 70i | 125i | 145i | 170i | 210i | 250i | 300i |
|---|---|---|---|---|---|---|---|
| A — DHW inlet | 414 | 414 | 414 | 414 | 414 | 414 | 414 |
| B — Primary coil connections | 373 | 373 | 373 | 373 | 373 | 373 | 373 |
| C — Secondary return | — | 709 | 810 | 934 | 1011 | 1238 | 1526 |
| D — T&P relief valve | 495 | 794 | 895 | 1020 | 1095 | 1323 | 1574 |
| E — Height | 802 | 1102 | 1229 | 1384 | 1486 | 1738 | 2053 |
| F — Depth (footprint) | 600 | 600 | 600 | 600 | 600 | 600 | 600 |
| G — Width (Ø) | 579 | 579 | 579 | 579 | 579 | 579 | 579 |
| H — Sensor pocket | 410 | 410 | 410 | 410 | 410 | 410 | 410 |
| I — Cable entry lower | 275 | 275 | 275 | 275 | 275 | 275 | 275 |
