Dorchester DR-TC solar water heater
Dorchester DR-TC solar water heater and solar panels
Dorchester DR-TC solar water heater cutaway
Dorchester DR-TC solar water heater
Dorchester DR-TC solar water heater installation

Hybrid solar hot water heater with integrated direct fired condensing gas burner for domestic hot water.

2 models available with continuous outputs (@44°C ∆T) of 820 & 1200 l/h.

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

Product information

    • Power outputs 41-59kW and storage capacity of 388 litres.
    • Saves energy and reduces gas bills by using free solar energy when available.
    • Fits in existing plant room with no back up heat source needed.
    • Safe and efficient domestic hot water generation.
    • Combats climate change with low carbon emissions.
    • Flexible temperature controls to help prioritise solar energy usage.
    • Compatible with Hamworthy Trigon solar thermal panels to ease project co-ordination.
    • Direct fired water heater can be operated independently from solar hot water system to allow a phased installation to spread the cost. 
    • Down firing pre-mix modulating burner reduces the risk of scale build up impacting on the heat transfer.
    • Natural gas and lpg water heater options.
    • Electronic anode fitted as standard.
    • Easy access for service and maintenance.
    • Full solar project assistance with hot water sizing (using T’Sol software) and  a dedicated hot water expert to guide you through product selection.
    • Extensive back up and support from our team of experienced engineers across the UK.
    • Long term commitment to spare parts.

Technical data

Units DR-TC 40
Continuous output with 44°C ΔT l/h 820
Continuous output with 50°C ΔT l/h 730
Continuous output with 55°C ΔT l/h 660
Storage capacity litres 388
Maximum operating water pressure (open vented) bar 8
Maximum operating water pressure (unvented) bar 5.5
T&P valve maximum temperature (unvented systems) °C 97
T&P valve maximum pressure (unvented systems) bar 7
Gross efficiency % 96
Heating-up time, ΔT = 44°C min. 16
Heating-up time, ΔT = 50°C min. 18
Heating-up time, ΔT = 55°C min. 20
Nat Gas
Input, gross – maximum kW 43.5
Input, net - maximum kW 39.2
Output – maximum kW 41.9
Gas inlet pressure – nominal mbar 20
Gas flow rate – maximum @1013.25 mbar and 15°C m3/h 4.2
Input, gross – maximum kW 42.6
Input, net - maximum kW 39.2
Output – maximum kW 41.9
Gas inlet pressure – nominal mbar 37
Gas flow rate – maximum@1013.25 mbar and 15°C kg/h 3.1
Approx flue gas vol * kg/h 57.7
Flue gas temperature – maximum °C 50
NOx emission* mg/kWh 51
Minimum pressure at flue outlet Pa 94
Water heater only,start current-max. (max. power) A (W) 0.6 (135)
Water heater only,run current-max. (max. power) A (W) 0.52 (120)
Electrical power rating of the solar pump-maximum W 165
Nominal supply voltage volts 230V 1PH 50Hz
Recommended solar fluid Propylene glycol e.g. Tyfocor L
Recommended solar fluid dilution (diluted 40% Tyfocor /60% water)
Maximum pressure of solar fluid circuit bar 6
Noise level @ 2m distance from roof duct dB(A) <45
Number of (power) anodes - 2
Approximate shipping weight kg 245
Maximum floor load/ weight filled with water kg 633
*dry air free,European Class 5. Max
**@15°C, 9.0% CO2, N.T.P. (Nat. Gas - G20)


Dorchester DR-TC brochure

Product brochures 3580 kb

Dorchester DR-TC dimensions

Dimensions 141 kb

Dorchester DR-TC solar water heater technical data table

Data tables 249 kb

Dorchester DR-TC installation manual

Installers guides 2164 kb

Dorchester DR-TC water heater wiring diagram

Wiring diagrams 75 kb

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 within the solar water heater.
  • Remote monitoring unit.
  • Heat metering equipment including RHI compliant apparatus.
  • Dummy sensor kit.
  • 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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