Multiple-tube, direct fired atmospheric water heater for domestic hot water.

13 models available with continuous outputs (@44°C ∆T) of 620, 819, 964, 1197, 1425, 1836 & 2103 (DR-LA only) l/h.

Due to the Energy-related Products (ErP) Directive regulations we will have a limited stock available of atmospheric water heaters. Talk to us today to secure your product or find out about availability.

 

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Fuel NG LPG product icon
Warranty 2 product item
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Dorchester DR-LA/DR-LP atmospheric water heater
  • Power outputs 31-107kW (DR-LA) and 31-93kW (DR-LP).
  • Storage capacities of 264-324 litres.
  • Easy fit replacement water heater reduces installation costs.
  • Safe and clean domestic hot water generation.
  • Easy access for service and maintenance.
  • Flexibility in system design with choice of horizontal or vertical flue take off position.
  • Compatible with most existing atmospheric flue designs.
  • Choose from fully automatic ignition with flame detection (DR-LA) or permanent pilot with thermocouple (DR-LP).
  • Natural gas and lpg water heater options.
  • Full project assistance 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.

Due to the Energy-related Products (ErP) Directive regulations we will have a limited stock available of atmospheric water heaters. Talk to us today to secure your product or find out about availability.

  Dorchester DR-LA/LP model Units DR-LA/LP 30 DR-LA/LP 40 DR-LA/LP 45 DR-LA/LP 60 DR-LA/LP 75 DR-LA/LP 95 DR-LA 110
Water Continuous output with 44°C ΔT l/h 620 819 964 1197 1425 1836 2103
Continuous output with 50°C ΔT l/h 545 721 848 1053 1254 1614 1851
Storage capacity litres 324 374 312 351 291 265 264
Maximum water pressure bar 8 8 8 8 8 8 8
Energy Heating-up time, ΔT = 44°C mins 31 27 19 17 12 8 7
Heating-up time, ΔT = 50°C mins 36 31 22 20 14 10 8
Gas Output maximum kW 31.7 41.9 49.3 61.2 72.9 93.9 107.6
Input (gross) maximum kW 41.4 55.4 65.2 81 96.4 124.2 140.6
Input (nett) maximum kW 37.3 49.9 58.7 72.9 86.8 111.8 126.6
Gas flow rate natural gas (G20) – Maximum m3/h 4 5.4 6.3 8.2 9.4 12.1 14
Nominal gas inlet pressure (NG) m3/h 1.4 2 2.4 3 3.4 4.3 4.9
Maximum gas inlet pressure (NG) mbar 20 20 20 20 20 20 20
Gas flow rate propane (G31) - Maximum mbar 25 25 25 25 25 25 25
Flue Maximum flue gas temperature °C 180 200 200 180 180 200 185
Connections Water flow and inlet connection in 1½" Rp 1½" Rp 1½" Rp 1½" Rp 1½" Rp 1½" Rp 1½" Rp
Gas connection in ¾" Rp ¾" Rp ¾" Rp ¾" Rp ¾" Rp ¾" Rp 1" Rp
Drain connection in 1½" Rp 1½" Rp 1½" Rp 1½" Rp 1½" Rp 1½" Rp 1½" Rp
T&P valve connection in 1" NPT 1" NPT 1" NPT 1" NPT 1½" Rp 1½" Rp 1½" Rp
Draught diverter spigot ID horizontal connection mm 150 150 150 180 180 225 225
Draught diverter spigot ID angled connection mm 150 150 180 180 225 225 225
  Nominal supply voltage   230V, 1Ph, 50Hz 230V, 1Ph, 50Hz 230V, 1Ph, 50Hz 230V, 1Ph, 50Hz 230V, 1Ph, 50Hz 230V, 1Ph, 50Hz 230V, 1Ph, 50Hz
  Approx. shipping weight kg 214 242 230 259 265 291 350
  Title Type Size  
Dorchester DR-LA and DR-LP water heater brochure Dorchester DR-LA and DR-LP water heater brochure Product brochures 4123 ko Download
Dorchester DR-LA and DR-LP water heater dimensions Dorchester DR-LA and DR-LP water heater dimensions Dimensions 104 ko Download
Dorchester DR-LA and DR-LP water heater technical data table Dorchester DR-LA and DR-LP water heater technical data table Data tables 44 ko Download
Dorchester DR-LA installation manual Dorchester DR-LA installation manual Installers guides 3295 ko Download
Dorchester DR-LP installation manual Dorchester DR-LP installation manual Installers guides 1453 ko Download
Dorchester DR-LA 110 front view Dorchester DR-LA 110 front view CAD 14 ko Download
Dorchester DR-LA 110 plan view Dorchester DR-LA 110 plan view CAD 16 ko Download
Dorchester DR-LA 30 front view Dorchester DR-LA 30 front view CAD 15 ko Download
Dorchester DR-LA 30 plan view Dorchester DR-LA 30 plan view CAD 17 ko Download
Dorchester DR-LA 40 front view Dorchester DR-LA 40 front view CAD 15 ko Download
Dorchester DR-LA 40 plan view Dorchester DR-LA 40 plan view CAD 10 ko Download
Dorchester DR-LA 45 front view Dorchester DR-LA 45 front view CAD 15 ko Download
Dorchester DR-LA 45 plan view Dorchester DR-LA 45 plan view CAD 15 ko Download
Dorchester DR-LA 60 front view Dorchester DR-LA 60 front view CAD 16 ko Download
Dorchester DR-LA 60 plan view Dorchester DR-LA 60 plan view CAD 15 ko Download
Dorchester DR-LA 75 front view Dorchester DR-LA 75 front view CAD 15 ko Download
Dorchester DR-LA 75 plan view Dorchester DR-LA 75 plan view CAD 16 ko Download
Dorchester DR-LA 95 front view Dorchester DR-LA 95 front view CAD 15 ko Download
Dorchester DR-LA 95 plan view Dorchester DR-LA 95 plan view CAD 15 ko Download
Dorchester DR-LP 30 front view Dorchester DR-LP 30 front view CAD 14 ko Download
Dorchester DR-LP 30 plan view Dorchester DR-LP 30 plan view CAD 10 ko Download
Dorchester DR-LP 40 front view Dorchester DR-LP 40 front view CAD 14 ko Download
Dorchester DR-LP 45 front view Dorchester DR-LP 45 front view CAD 14 ko Download
Dorchester DR-LP 45 plan view Dorchester DR-LP 45 plan view CAD 10 ko Download
Dorchester DR-LP 60 front view Dorchester DR-LP 60 front view CAD 14 ko Download
Dorchester DR-LP 60 plan view Dorchester DR-LP 60 plan view CAD 10 ko Download
Dorchester DR-LP 75 front view Dorchester DR-LP 75 front view CAD 14 ko Download
Dorchester DR-LP 75 plan view Dorchester DR-LP 75 plan view CAD 10 ko Download
Dorchester DR-LP 95 front view Dorchester DR-LP 95 front view CAD 14 ko Download
Dorchester DR-LP 95 plan view Dorchester DR-LP 95 plan view CAD 10 ko Download
Dorchester DR-RS 85 front view Dorchester DR-RS 85 front view CAD 13 ko Download
Dorchester DR LA water heater wiring diagram Dorchester DR LA water heater wiring diagram Wiring diagrams 117 ko Download
Dorchester DR-LP water heater wiring diagram Dorchester DR-LP water heater wiring diagram Wiring diagrams 102 ko Download
Dorchester DR-LA seasonal efficiency sheet Dorchester DR-LA seasonal efficiency sheet Seasonal efficiency sheets 86 ko Download
Dorchester DR-LP seasonal efficiency sheet Dorchester DR-LP seasonal efficiency sheet Seasonal efficiency sheets 86 ko Download
  • Easy fit replacement for refurbishment projects.
  • Medium sized commercial and public buildings including schools, hospitals, offices and hotels.
  • Large commercial and public buildings including schools, hospitals and hotels.
  • Locations with substantial and continuous hot water demands including hospitals, hotels and sports facilities.
  • To see where Dorchester atmospheric water heaters have been used visit the case study section of our website.
  • 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.
  • Electrical anode protection.
  • Flexible replacement anodes.
  • Choice of flue take-off: 45° angled or horizontal position for ease off integrating with existing flues. Please specify when ordering.
  • Choose from a wide range of service contracts to help maintain optimum performance. Book commissioning at the same time as placing your order for improved warranty terms.