Dorchester DR-FC Evo condensing water heater
Dorchester DR-FC Evo condensing water heater cutaway
Dorchester DR-FC Evo condensing water heater
Dorchester DR-FC Evo condensing water heater

Fully automatic, condensing direct fired water heater for domestic hot water.

7 models available with continuous outputs (@44°C ∆T) of 600, 630, 970, 1200, 1700, 2000 & 2400 l/h.

Efficiency 98 product icon
Fuel NG LPG product icon
Warranty 2 product item
ErP Part L Compliant product icon
BIM objects icon

Product information

    • Power outputs 30-119kW and storage capacities of 227-504 litres.
    • Safe and clean domestic hot water generation.
    • Reduces energy use and running costs by maximising condensing water heater performance.
    • Meets the strict standards for efficiencies and NOx emissions in new buildings.
    • Ultra-quiet operation means it can be installed close to point of use without disturbance to occupants.
    • Closely matches hot water demand, reducing wastage.
    • Down firing pre-mix modulating burner reduces the risk of scale build up impacting on the heat transfer.
    • Large range of time and temperature control features built in as standard.
    • Electronic Anode fitted as standard.
    • Natural gas and lpg water heater options.
    • Easy access for service and maintenance.
    • Full project assistance available from our dedicated hot water expert to help with hot water sizing and selection of equipment to match the application.
    • Extensive back up and support from our team of experienced engineers across the UK.
    • Long term commitment to spare parts.
    • Water heater BIM objects available to assist in project design and management
    • Available for next day delivery (dependent on stock availability, charges apply, order cut-off 12pm).

Technical data

Units DR-FC Evo 25
Building Regulations thermal efficiency gross % 96
ErP efficiency rating (modules ≤ 70 kW only) - A
Heating-up time, ΔT = 44°C min. 23
Heating-up time, ΔT = 50°C min. 26
Heating-up time, ΔT = 55°C min. 29
Standby losses kW/24h 4.2
Continuous output with 44°C ΔT l/h 600
1st hour output with 44°C ΔT l 730
Continuous output with 50°C ΔT l/h 530
1st hour output with 50°C ΔT l 630
Continuous output with 55°C ΔT l/h 480
1st hour output with 55°C ΔT l 560
Storage capacity litres 227
Maximum operating water pressure (open vented) bar 8
Maximum operating water pressure (unvented) bar 5.3
Expansion relief valve setting (unvented kit) bar 6
ErP load profile - XXL
Nat Gas
Input, gross – maximum kW 31.6
Output – maximum kW 30.5
Gas inlet pressure – nominal mbar 20
Gas flow rate – maximum @1013.25 mbar and 15°C m3/h 3.1
Input, gross – maximum kW 31
Output – maximum kW 30.5
Gas inlet pressure – nominal mbar 37
Gas flow rate – maximum@1013.25 mbar and 15°C kg/h 2.3
Approximate flue gas volume @15°C, 9.8% CO2, N.T.P. (Nat. Gas - G20) kg/h 51.7
Flue gas temperature – maximum °C 45
NOx emission, dry air free,European Class 5. Maximum (at part load) mg/kWh 24
Pressure at the flue outlet only (B23) with zero pressure at air inlet Pa 52
Start current–maximum (maximum power) A (W) 0.59 (135)
Run current–maximum (maximum power) A (W) 0.2 (45)
Electrical supply Vac 230 V 1 PH 50 Hz
Voltage tolerance % of Vac -15% +10%
Noise level @2m from flue terminal dB(A) <45
Number of (power) anodes - 1
Weight when empty kg 196
Approximate shipping weight kg 215
Maximum floor load/ weight filled with water kg 423


Dorchester DR-FC Evo brochure

Product brochures 4936 kb

Dorchester DR-FC Evo 25-120 installation manual

Installers guides 4040 kb

Dorchester DR-FC Evo hydraulic schemes

Hydraulic schematics 249 kb

Dorchester DR-FC-Evo 120 CAD

CAD 49 kb

Dorchester DR-FC-Evo 25 CAD

CAD 48 kb

Dorchester DR-FC-Evo 30 CAD

CAD 48 kb

Dorchester DR-FC-Evo 45 CAD

CAD 48 kb

Dorchester DR-FC-Evo 60 CAD

CAD 48 kb

Dorchester DR-FC-Evo 80 CAD

CAD 49 kb

Dorchester DR-FC-Evo 95 CAD

CAD 50 kb


The equipment needed to be able to respond rapidly to demand, as well as meet the strict building regulation standards required for new buildings on energy efficiency. Hamworthy’s condensing water heaters fitted the bill perfectly.

Stuart Hayward, J Tomlinson

The Dorchester DR-FC Evo model was selected for its condensing technology and proven reliability continuing the long line of Dorchester water heaters we have specified over the years. The destratification kits help with Legionella protection.

Andy Cope, Mabey Francis

Ideal uses/applications

Optional extras

  • Unvented water supply kit - essential for any unvented application and includes an expansion vessel sized for the water heater and local pipework only.
  • Top to bottom pump recirculation pump kit to prevent stratification and protect against legionella within the water heater.
  • Remote monitoring unit.
  • Room Sealed Flue Systems:
    • Concentric flue systems type C13–Horizontal termination.
    • Concentric flue systems type C33–Vertical termination.
    • Twin duct flue systems type C53–Vertical flue termination with Horizontal air inlet.
  • Conventional Open Flue Systems:
    • Open flue systems type B23–Vertical termination.
  • Choose from a wide range of service contracts to help maintain optimum performance.
  • Ensure your new Hamworthy products are set to our recommendations and benefit from improved warranty terms with a commissioning package.

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Case studies

Bourne View care home in Poole

Bourne View Care Home

Sector: Care homes

Project: The prestigious local care home in Art Deco style was opened in April 2019 and looking for reliable boilers and water heaters to keep the future residents safe.

Building: New build care home

Application: Space heating 382kW, DHW 1,940 l/h l/h

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Abbey Hill Academy had new cast iron condensing boilers and direct fired water heaters installed for improved efficiency and shower pressure.

Abbey Hill Academy

Sector: Education

Project: The special needs school benefitted from the Condition Improvement Fund to refurbish their old school heating and hot water system.

Building: Special needs school refurbishment

Application: Space heating, 360kW, direct fired DHW

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Hamworthy's wall hung Stratton boilers and Dorchester DR-FC water heaters deliver efficient heating and hot water to Nottingham University.

Nottingham University

Sector: Education

Project: A four million pound development has seen the construction of two new sports pavilions with a high demand for hot water.

Building: New build, sports complex

Application: Space heating, domestic hot water

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Molesey Hospital updated their heating and hot water system with Hamworthy boilers and water heaters.

Molesey Hospital

Sector: Public sector

Project: NHS Surrey embarked on a programme of upgrade to their heating and hot water systems across more than twenty sites.

Building: Hospital refurbishment

Application: Space heating, 140kW. Water heating 1,269l/h

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Drayton Manor benefits from Hamworthy high efficiency steel shell boilers and direct-fired condensing water heaters.

Drayton Manor Hotel, Staffordshire

Sector: Hotel and leisure

Project: Guests benefit from the installation of three new Dorchester DR-FC Evo water heaters and two Ensbury LT 370 low temperature steel boilers.

Building: New build hotel

Application: Domestic hot water, 5787 litres/hour. Space heating, 740kW

Learn more