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Heatrae Sadia Megaflo Eco Direct Unvented Hot Water Cylinder – 70D / 125DD / 145DD / 170DD / 210DD / 250DD / 300DD
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Heatrae Sadia Megaflo Eco Direct Unvented Hot Water Cylinder – 70D / 125DD / 145DD / 170DD / 210DD / 250DD / 300DD

Heatrae Sadia Megaflo Eco Direct Unvented Hot Water Cylinder – 70D / 125DD / 145DD / 170DD / 210DD / 250DD / 300DD

The Heatrae Sadia Megaflo Eco Direct is the UK's best-selling unvented hot water cylinder — a high-performance, directly electrically heated mains-pressure system built from high-grade duplex stainless steel and backed by a lifetime guarantee on the inner tank. With no need for a cold-water tank in the loft, no external expansion vessel, and mains-pressure delivery of up to 76 litres per minute at 3 bar, the Megaflo Eco Direct delivers fast-filling baths, powerful showers, and consistent hot water performance throughout the home — without pumps.

76 l/min
Max flow at 3 bar
70–300L
Capacity range
60 mm
CFC-free insulation
3 kW × 2
Titanium elements (DD)
Lifetime
Inner-tank guarantee
⚠ Installer Requirement
Megaflo Eco Direct cylinders must be installed and commissioned by a G3 competent person (or under Building Warrant in Scotland / Building Regulation P5 in Northern Ireland). All electrical connections must be made by a qualified electrician in accordance with current IET Wiring Regulations. Always leave this product guide with the customer.
ℹ Direct (electrically heated) models
These cylinders heat domestic hot water electrically only — they do not connect to a boiler. If you need both radiator heating and hot water from a single cylinder, please see our Megaflo Eco Indirect range instead.
KEY FEATURES
🔵 Internal Expansion — No External Vessel

The patented internal floating-baffle expansion system accommodates thermal expansion within the cylinder itself. This eliminates the need for an external expansion vessel, reducing pipework, saving space, and simplifying installation — ideal for retrofit projects with limited plant-room space.

🔵 Titanium Immersion Heaters

All direct models are fitted with titanium heating elements — the highest-grade choice for longevity in even hard or aggressive water conditions. The unique 'L'-shaped immersion heater maximises the volume of water that can be heated electrically, reducing energy consumption during partial draws.

🔵 Duplex Stainless Steel Construction

The inner vessel is fabricated from high-grade duplex stainless steel, pressure-tested to 15 bar. This alloy delivers exceptional corrosion resistance and a high strength-to-weight ratio, which is why Heatrae Sadia backs it with a full lifetime guarantee on the inner tank for domestic installations.

🔵 Mains-Pressure Performance — No Pump Required

Connected directly to the incoming mains, the Megaflo Eco Direct delivers up to 76 litres per minute at 3 bar — enough for multiple simultaneous outlets. Because pressure is mains-derived, no shower pumps or header tanks are required, dramatically reducing system complexity.

🔵 60 mm CFC/HCFC-Free Insulation

A 60 mm layer of fire-retardant polyurethane foam (zero ozone depletion, GWP = 3.1) surrounds the entire cylinder, giving the range its excellent standing heat-loss figures. Combined with the insulated T&P valve, heat retention exceeds the requirements of Building Regulations Part L.

🔵 Full Safety Controls Supplied

Every cylinder ships with a complete cold-water inlet control kit — 3 bar PRV, 8 bar pressure relief valve, ¼-turn isolating valve, line strainer, non-return valve and drain cock — plus a factory-fitted 90 °C / 10 bar T&P relief valve, tundish, and T&P insulation kit. Nothing extra to source.

🔵 Flexible Siting — No Loft Tanks

Because the Megaflo Eco is fed directly from the mains, no cold-water storage cistern is required in the loft, freeing up roof space and removing a source of contamination risk. The cylinder can be located almost anywhere in the property — including airing cupboards, utility rooms, or garages — provided discharge pipework can be correctly run.

🔵 ErP-Rated & Regulation-Compliant

All models carry an EU Energy Related Products (ErP) efficiency rating (B or C depending on size), demonstrating compliance with energy-labelling requirements. The Megaflo Eco also complies with Building Regulations G3 and L, Water Supply (Water Fittings) Regulations, and holds Kiwa certification (No. 1608707).

WHAT'S INCLUDED AS STANDARD
  • Factory-fitted titanium immersion heater(s) with thermal controls & 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
  • Factory-fitted T&P relief valve set at 90 °C / 10 bar (BS EN 1490)
  • T&P valve insulation kit
  • 15/22 mm tundish
  • Lifting handle
  • Compression nuts and olives (22 mm)
FULL SPECIFICATIONS — ALL DIRECT VARIANTS
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 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 element rating 3 kW @ 240 V / 2.8 kW @ 230 V (AC only)
Connections 22 mm compression / ¾" BSP
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 70D 125DD 145DD 170DD 210DD 250DD 300DD
Product code 95050460 95050462 95050464 95050466 95050468 95050470 95050473
Nominal capacity (L) 70 125 145 170 210 250 300
Immersion heaters (No. × kW) 1 × 3 2 × 3 2 × 3 2 × 3 2 × 3 2 × 3 2 × 3
ErP efficiency class B B C C C C C
ErP efficiency (%) 38.6 39.2 37.5 38.2 37.5 37.8 37.7
ErP load profile M M M L L L XL
Storage volume @ 3 bar (L) 92 140 155 182 199 236 283
Mixed water V40 at 40 °C (L) 78 167 183 218 241 307 359
Max flow at 3 bar (L/min) 76 76 76 76 76 76 76
Max flow at 1 bar (L/min) 45 45 45 45 45 45 45
Heat-up time (6 kW, full tank) — 71 min 79 min 93 min 102 min 121 min 146 min
Heat-up time (3 kW, 70D) 92 min — — — — — —
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
Weight empty (kg) 23 25 31 34 38 46 56
Weight full (kg) 115 165 183 216 237 282 339
DIMENSIONS (mm)
Dimension 70D 125DD 145DD 170DD 210DD 250DD 300DD
A — DHW inlet 414 414 414 414 414 414 414
B — Cable entry lower 275 275 275 275 275 275 275
C — Cable entry upper — 549 580 705 801 1009 1313
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
WHICH SIZE DO I NEED?
Model Typical application Bedrooms Bathrooms
70D Studio flat or single-person home; supplementary cylinder 1 1
125DD 1–2 bedroom property; 2–3 occupants 1–2 1
145DD 2 bedroom property; 2–3 occupants with higher demand 2 1–2
170DD 3 bedroom property; 3–4 occupants 3 1–2
210DD 4 bedroom property; 4–5 occupants; en-suite demands 4 2
250DD 4–5 bedroom property; 5–6 occupants; multiple bathrooms 4–5 2–3
300DD 5–6 bedroom property; 6+ occupants; high simultaneous demand 5–6 3+
FREQUENTLY ASKED QUESTIONS
What is the difference between the 70D and the DD models?
The 70D is fitted with a single 3 kW titanium immersion heater, making it suited to smaller properties with lower daily hot-water demand. The DD models (125DD through 300DD) come with two 3 kW elements (6 kW total) for significantly faster heat-up times and greater recovery capacity — important when multiple outlets are used simultaneously in larger homes. Choosing a DD model gives you the flexibility to run just one element on off-peak tariffs and both elements for a rapid boost.
Do I need a separate expansion vessel with the Megaflo Eco Direct?
No. The Megaflo Eco's patented internal floating-baffle system accommodates thermal expansion within the cylinder itself, so there is no requirement for an external expansion vessel. This is one of the key advantages over older unvented designs — the installation footprint is smaller, pipework is neater, and there is one fewer component to service or replace.
What mains pressure do I need for a Megaflo Eco to perform well?
The minimum recommended supply is 0.15 MPa (1.5 bar) at 20 litres per minute. The cold-water combination valve supplied regulates operating pressure to 3 bar, regardless of incoming mains pressure (up to 16 bar). Performance at 1.5 bar / 20 l/min will be adequate but modest — for the best shower and bath-fill experience, a higher mains flow rate is beneficial. The combination valve's PRV is factory-set and non-adjustable.
Can the Megaflo Eco Direct be connected to a boiler or solar thermal system?
No — these are direct-only cylinders. They are heated exclusively by their titanium electric immersion heaters. If you want to use a boiler, solar thermal, or heat pump as a primary heat source (with electric immersion as backup), you need a Megaflo Eco Indirect or Megaflo Eco Solar model, which include a primary heating coil. Contact us if you need guidance on selecting the right variant.
Who can install a Megaflo Eco Direct, and what regulations apply?
Installation must be carried out by a G3 Competent Person (England & Wales) — or under Building Warrant (Scotland) / Building Regulation P5 (Northern Ireland). All electrical connections must be made by a qualified electrician to IET Wiring Regulations. The installer must complete the Benchmark commissioning checklist and leave the product guide with the householder. The cylinder must comply with Building Regulations Part G (unvented hot water), Part L (energy efficiency), and the Water Supply (Water Fittings) Regulations.
What is the guarantee on the Megaflo Eco?
Select Capacity
From $537.10

Original: $1,534.57

-65%
Heatrae Sadia Megaflo Eco Direct Unvented Hot Water Cylinder – 70D / 125DD / 145DD / 170DD / 210DD / 250DD / 300DD—

$1,534.57

$537.10

More Images

Heatrae Sadia Megaflo Eco Direct Unvented Hot Water Cylinder – 70D / 125DD / 145DD / 170DD / 210DD / 250DD / 300DD - Image 2

Heatrae Sadia Megaflo Eco Direct Unvented Hot Water Cylinder – 70D / 125DD / 145DD / 170DD / 210DD / 250DD / 300DD

The Heatrae Sadia Megaflo Eco Direct is the UK's best-selling unvented hot water cylinder — a high-performance, directly electrically heated mains-pressure system built from high-grade duplex stainless steel and backed by a lifetime guarantee on the inner tank. With no need for a cold-water tank in the loft, no external expansion vessel, and mains-pressure delivery of up to 76 litres per minute at 3 bar, the Megaflo Eco Direct delivers fast-filling baths, powerful showers, and consistent hot water performance throughout the home — without pumps.

76 l/min
Max flow at 3 bar
70–300L
Capacity range
60 mm
CFC-free insulation
3 kW × 2
Titanium elements (DD)
Lifetime
Inner-tank guarantee
⚠ Installer Requirement
Megaflo Eco Direct cylinders must be installed and commissioned by a G3 competent person (or under Building Warrant in Scotland / Building Regulation P5 in Northern Ireland). All electrical connections must be made by a qualified electrician in accordance with current IET Wiring Regulations. Always leave this product guide with the customer.
ℹ Direct (electrically heated) models
These cylinders heat domestic hot water electrically only — they do not connect to a boiler. If you need both radiator heating and hot water from a single cylinder, please see our Megaflo Eco Indirect range instead.
KEY FEATURES
🔵 Internal Expansion — No External Vessel

The patented internal floating-baffle expansion system accommodates thermal expansion within the cylinder itself. This eliminates the need for an external expansion vessel, reducing pipework, saving space, and simplifying installation — ideal for retrofit projects with limited plant-room space.

🔵 Titanium Immersion Heaters

All direct models are fitted with titanium heating elements — the highest-grade choice for longevity in even hard or aggressive water conditions. The unique 'L'-shaped immersion heater maximises the volume of water that can be heated electrically, reducing energy consumption during partial draws.

🔵 Duplex Stainless Steel Construction

The inner vessel is fabricated from high-grade duplex stainless steel, pressure-tested to 15 bar. This alloy delivers exceptional corrosion resistance and a high strength-to-weight ratio, which is why Heatrae Sadia backs it with a full lifetime guarantee on the inner tank for domestic installations.

🔵 Mains-Pressure Performance — No Pump Required

Connected directly to the incoming mains, the Megaflo Eco Direct delivers up to 76 litres per minute at 3 bar — enough for multiple simultaneous outlets. Because pressure is mains-derived, no shower pumps or header tanks are required, dramatically reducing system complexity.

🔵 60 mm CFC/HCFC-Free Insulation

A 60 mm layer of fire-retardant polyurethane foam (zero ozone depletion, GWP = 3.1) surrounds the entire cylinder, giving the range its excellent standing heat-loss figures. Combined with the insulated T&P valve, heat retention exceeds the requirements of Building Regulations Part L.

🔵 Full Safety Controls Supplied

Every cylinder ships with a complete cold-water inlet control kit — 3 bar PRV, 8 bar pressure relief valve, ¼-turn isolating valve, line strainer, non-return valve and drain cock — plus a factory-fitted 90 °C / 10 bar T&P relief valve, tundish, and T&P insulation kit. Nothing extra to source.

🔵 Flexible Siting — No Loft Tanks

Because the Megaflo Eco is fed directly from the mains, no cold-water storage cistern is required in the loft, freeing up roof space and removing a source of contamination risk. The cylinder can be located almost anywhere in the property — including airing cupboards, utility rooms, or garages — provided discharge pipework can be correctly run.

🔵 ErP-Rated & Regulation-Compliant

All models carry an EU Energy Related Products (ErP) efficiency rating (B or C depending on size), demonstrating compliance with energy-labelling requirements. The Megaflo Eco also complies with Building Regulations G3 and L, Water Supply (Water Fittings) Regulations, and holds Kiwa certification (No. 1608707).

WHAT'S INCLUDED AS STANDARD
  • Factory-fitted titanium immersion heater(s) with thermal controls & 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
  • Factory-fitted T&P relief valve set at 90 °C / 10 bar (BS EN 1490)
  • T&P valve insulation kit
  • 15/22 mm tundish
  • Lifting handle
  • Compression nuts and olives (22 mm)
FULL SPECIFICATIONS — ALL DIRECT VARIANTS
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 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 element rating 3 kW @ 240 V / 2.8 kW @ 230 V (AC only)
Connections 22 mm compression / ¾" BSP
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 70D 125DD 145DD 170DD 210DD 250DD 300DD
Product code 95050460 95050462 95050464 95050466 95050468 95050470 95050473
Nominal capacity (L) 70 125 145 170 210 250 300
Immersion heaters (No. × kW) 1 × 3 2 × 3 2 × 3 2 × 3 2 × 3 2 × 3 2 × 3
ErP efficiency class B B C C C C C
ErP efficiency (%) 38.6 39.2 37.5 38.2 37.5 37.8 37.7
ErP load profile M M M L L L XL
Storage volume @ 3 bar (L) 92 140 155 182 199 236 283
Mixed water V40 at 40 °C (L) 78 167 183 218 241 307 359
Max flow at 3 bar (L/min) 76 76 76 76 76 76 76
Max flow at 1 bar (L/min) 45 45 45 45 45 45 45
Heat-up time (6 kW, full tank) — 71 min 79 min 93 min 102 min 121 min 146 min
Heat-up time (3 kW, 70D) 92 min — — — — — —
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
Weight empty (kg) 23 25 31 34 38 46 56
Weight full (kg) 115 165 183 216 237 282 339
DIMENSIONS (mm)
Dimension 70D 125DD 145DD 170DD 210DD 250DD 300DD
A — DHW inlet 414 414 414 414 414 414 414
B — Cable entry lower 275 275 275 275 275 275 275
C — Cable entry upper — 549 580 705 801 1009 1313
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
WHICH SIZE DO I NEED?
Model Typical application Bedrooms Bathrooms
70D Studio flat or single-person home; supplementary cylinder 1 1
125DD 1–2 bedroom property; 2–3 occupants 1–2 1
145DD 2 bedroom property; 2–3 occupants with higher demand 2 1–2
170DD 3 bedroom property; 3–4 occupants 3 1–2
210DD 4 bedroom property; 4–5 occupants; en-suite demands 4 2
250DD 4–5 bedroom property; 5–6 occupants; multiple bathrooms 4–5 2–3
300DD 5–6 bedroom property; 6+ occupants; high simultaneous demand 5–6 3+
FREQUENTLY ASKED QUESTIONS
What is the difference between the 70D and the DD models?
The 70D is fitted with a single 3 kW titanium immersion heater, making it suited to smaller properties with lower daily hot-water demand. The DD models (125DD through 300DD) come with two 3 kW elements (6 kW total) for significantly faster heat-up times and greater recovery capacity — important when multiple outlets are used simultaneously in larger homes. Choosing a DD model gives you the flexibility to run just one element on off-peak tariffs and both elements for a rapid boost.
Do I need a separate expansion vessel with the Megaflo Eco Direct?
No. The Megaflo Eco's patented internal floating-baffle system accommodates thermal expansion within the cylinder itself, so there is no requirement for an external expansion vessel. This is one of the key advantages over older unvented designs — the installation footprint is smaller, pipework is neater, and there is one fewer component to service or replace.
What mains pressure do I need for a Megaflo Eco to perform well?
The minimum recommended supply is 0.15 MPa (1.5 bar) at 20 litres per minute. The cold-water combination valve supplied regulates operating pressure to 3 bar, regardless of incoming mains pressure (up to 16 bar). Performance at 1.5 bar / 20 l/min will be adequate but modest — for the best shower and bath-fill experience, a higher mains flow rate is beneficial. The combination valve's PRV is factory-set and non-adjustable.
Can the Megaflo Eco Direct be connected to a boiler or solar thermal system?
No — these are direct-only cylinders. They are heated exclusively by their titanium electric immersion heaters. If you want to use a boiler, solar thermal, or heat pump as a primary heat source (with electric immersion as backup), you need a Megaflo Eco Indirect or Megaflo Eco Solar model, which include a primary heating coil. Contact us if you need guidance on selecting the right variant.
Who can install a Megaflo Eco Direct, and what regulations apply?
Installation must be carried out by a G3 Competent Person (England & Wales) — or under Building Warrant (Scotland) / Building Regulation P5 (Northern Ireland). All electrical connections must be made by a qualified electrician to IET Wiring Regulations. The installer must complete the Benchmark commissioning checklist and leave the product guide with the householder. The cylinder must comply with Building Regulations Part G (unvented hot water), Part L (energy efficiency), and the Water Supply (Water Fittings) Regulations.
What is the guarantee on the Megaflo Eco?

Product Information

Shipping & Returns

Description

The Heatrae Sadia Megaflo Eco Direct is the UK's best-selling unvented hot water cylinder — a high-performance, directly electrically heated mains-pressure system built from high-grade duplex stainless steel and backed by a lifetime guarantee on the inner tank. With no need for a cold-water tank in the loft, no external expansion vessel, and mains-pressure delivery of up to 76 litres per minute at 3 bar, the Megaflo Eco Direct delivers fast-filling baths, powerful showers, and consistent hot water performance throughout the home — without pumps.

76 l/min
Max flow at 3 bar
70–300L
Capacity range
60 mm
CFC-free insulation
3 kW × 2
Titanium elements (DD)
Lifetime
Inner-tank guarantee
⚠ Installer Requirement
Megaflo Eco Direct cylinders must be installed and commissioned by a G3 competent person (or under Building Warrant in Scotland / Building Regulation P5 in Northern Ireland). All electrical connections must be made by a qualified electrician in accordance with current IET Wiring Regulations. Always leave this product guide with the customer.
ℹ Direct (electrically heated) models
These cylinders heat domestic hot water electrically only — they do not connect to a boiler. If you need both radiator heating and hot water from a single cylinder, please see our Megaflo Eco Indirect range instead.
KEY FEATURES
🔵 Internal Expansion — No External Vessel

The patented internal floating-baffle expansion system accommodates thermal expansion within the cylinder itself. This eliminates the need for an external expansion vessel, reducing pipework, saving space, and simplifying installation — ideal for retrofit projects with limited plant-room space.

🔵 Titanium Immersion Heaters

All direct models are fitted with titanium heating elements — the highest-grade choice for longevity in even hard or aggressive water conditions. The unique 'L'-shaped immersion heater maximises the volume of water that can be heated electrically, reducing energy consumption during partial draws.

🔵 Duplex Stainless Steel Construction

The inner vessel is fabricated from high-grade duplex stainless steel, pressure-tested to 15 bar. This alloy delivers exceptional corrosion resistance and a high strength-to-weight ratio, which is why Heatrae Sadia backs it with a full lifetime guarantee on the inner tank for domestic installations.

🔵 Mains-Pressure Performance — No Pump Required

Connected directly to the incoming mains, the Megaflo Eco Direct delivers up to 76 litres per minute at 3 bar — enough for multiple simultaneous outlets. Because pressure is mains-derived, no shower pumps or header tanks are required, dramatically reducing system complexity.

🔵 60 mm CFC/HCFC-Free Insulation

A 60 mm layer of fire-retardant polyurethane foam (zero ozone depletion, GWP = 3.1) surrounds the entire cylinder, giving the range its excellent standing heat-loss figures. Combined with the insulated T&P valve, heat retention exceeds the requirements of Building Regulations Part L.

🔵 Full Safety Controls Supplied

Every cylinder ships with a complete cold-water inlet control kit — 3 bar PRV, 8 bar pressure relief valve, ¼-turn isolating valve, line strainer, non-return valve and drain cock — plus a factory-fitted 90 °C / 10 bar T&P relief valve, tundish, and T&P insulation kit. Nothing extra to source.

🔵 Flexible Siting — No Loft Tanks

Because the Megaflo Eco is fed directly from the mains, no cold-water storage cistern is required in the loft, freeing up roof space and removing a source of contamination risk. The cylinder can be located almost anywhere in the property — including airing cupboards, utility rooms, or garages — provided discharge pipework can be correctly run.

🔵 ErP-Rated & Regulation-Compliant

All models carry an EU Energy Related Products (ErP) efficiency rating (B or C depending on size), demonstrating compliance with energy-labelling requirements. The Megaflo Eco also complies with Building Regulations G3 and L, Water Supply (Water Fittings) Regulations, and holds Kiwa certification (No. 1608707).

WHAT'S INCLUDED AS STANDARD
  • Factory-fitted titanium immersion heater(s) with thermal controls & 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
  • Factory-fitted T&P relief valve set at 90 °C / 10 bar (BS EN 1490)
  • T&P valve insulation kit
  • 15/22 mm tundish
  • Lifting handle
  • Compression nuts and olives (22 mm)
FULL SPECIFICATIONS — ALL DIRECT VARIANTS
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 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 element rating 3 kW @ 240 V / 2.8 kW @ 230 V (AC only)
Connections 22 mm compression / ¾" BSP
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 70D 125DD 145DD 170DD 210DD 250DD 300DD
Product code 95050460 95050462 95050464 95050466 95050468 95050470 95050473
Nominal capacity (L) 70 125 145 170 210 250 300
Immersion heaters (No. × kW) 1 × 3 2 × 3 2 × 3 2 × 3 2 × 3 2 × 3 2 × 3
ErP efficiency class B B C C C C C
ErP efficiency (%) 38.6 39.2 37.5 38.2 37.5 37.8 37.7
ErP load profile M M M L L L XL
Storage volume @ 3 bar (L) 92 140 155 182 199 236 283
Mixed water V40 at 40 °C (L) 78 167 183 218 241 307 359
Max flow at 3 bar (L/min) 76 76 76 76 76 76 76
Max flow at 1 bar (L/min) 45 45 45 45 45 45 45
Heat-up time (6 kW, full tank) — 71 min 79 min 93 min 102 min 121 min 146 min
Heat-up time (3 kW, 70D) 92 min — — — — — —
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
Weight empty (kg) 23 25 31 34 38 46 56
Weight full (kg) 115 165 183 216 237 282 339
DIMENSIONS (mm)
Dimension 70D 125DD 145DD 170DD 210DD 250DD 300DD
A — DHW inlet 414 414 414 414 414 414 414
B — Cable entry lower 275 275 275 275 275 275 275
C — Cable entry upper — 549 580 705 801 1009 1313
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
WHICH SIZE DO I NEED?
Model Typical application Bedrooms Bathrooms
70D Studio flat or single-person home; supplementary cylinder 1 1
125DD 1–2 bedroom property; 2–3 occupants 1–2 1
145DD 2 bedroom property; 2–3 occupants with higher demand 2 1–2
170DD 3 bedroom property; 3–4 occupants 3 1–2
210DD 4 bedroom property; 4–5 occupants; en-suite demands 4 2
250DD 4–5 bedroom property; 5–6 occupants; multiple bathrooms 4–5 2–3
300DD 5–6 bedroom property; 6+ occupants; high simultaneous demand 5–6 3+
FREQUENTLY ASKED QUESTIONS
What is the difference between the 70D and the DD models?
The 70D is fitted with a single 3 kW titanium immersion heater, making it suited to smaller properties with lower daily hot-water demand. The DD models (125DD through 300DD) come with two 3 kW elements (6 kW total) for significantly faster heat-up times and greater recovery capacity — important when multiple outlets are used simultaneously in larger homes. Choosing a DD model gives you the flexibility to run just one element on off-peak tariffs and both elements for a rapid boost.
Do I need a separate expansion vessel with the Megaflo Eco Direct?
No. The Megaflo Eco's patented internal floating-baffle system accommodates thermal expansion within the cylinder itself, so there is no requirement for an external expansion vessel. This is one of the key advantages over older unvented designs — the installation footprint is smaller, pipework is neater, and there is one fewer component to service or replace.
What mains pressure do I need for a Megaflo Eco to perform well?
The minimum recommended supply is 0.15 MPa (1.5 bar) at 20 litres per minute. The cold-water combination valve supplied regulates operating pressure to 3 bar, regardless of incoming mains pressure (up to 16 bar). Performance at 1.5 bar / 20 l/min will be adequate but modest — for the best shower and bath-fill experience, a higher mains flow rate is beneficial. The combination valve's PRV is factory-set and non-adjustable.
Can the Megaflo Eco Direct be connected to a boiler or solar thermal system?
No — these are direct-only cylinders. They are heated exclusively by their titanium electric immersion heaters. If you want to use a boiler, solar thermal, or heat pump as a primary heat source (with electric immersion as backup), you need a Megaflo Eco Indirect or Megaflo Eco Solar model, which include a primary heating coil. Contact us if you need guidance on selecting the right variant.
Who can install a Megaflo Eco Direct, and what regulations apply?
Installation must be carried out by a G3 Competent Person (England & Wales) — or under Building Warrant (Scotland) / Building Regulation P5 (Northern Ireland). All electrical connections must be made by a qualified electrician to IET Wiring Regulations. The installer must complete the Benchmark commissioning checklist and leave the product guide with the householder. The cylinder must comply with Building Regulations Part G (unvented hot water), Part L (energy efficiency), and the Water Supply (Water Fittings) Regulations.
What is the guarantee on the Megaflo Eco?