Due to the Energy-related Products (ErP) Directive regulations this product is no longer available.

Please see our range of ErP compliant condensing water heaters:

Dorchester DR-FC Evo condensing water heater - 7 models available with continuous outputs (@44°C ∆T) of 600, 630, 970, 1200, 1700, 2000 & 2400 l/h.

Dorchester DR-CC compact condensing water heater - 9 models available with continuous outputs (@44°C ∆T) of 228, 233, 374, 461, 465, 602, 608 & 614 l/h.

Due to the Energy-related Products (ErP) Directive regulations this product is no longer available.

Please see our range of ErP compliant condensing water heaters:

Dorchester DR-FC Evo condensing water heater - 7 models available with continuous outputs (@44°C ∆T) of 600, 630, 970, 1200, 1700, 2000 & 2400 l/h.

Dorchester DR-CC compact condensing water heater - 9 models available with continuous outputs (@44°C ∆T) of 228, 233, 374, 461, 465, 602, 608 & 614 l/h.

Specification Units Dorchester DR-RS Model  
DR-RS 25 DR-RS 40 DR-RS 65 DR-RS 85 DR-RS 105
Water Continuous output with 44°C ΔT l/h 507 811 1293 1740 1960
Continuous output with 50°C ΔT l/h 446 714 1138 1531 1725
Continuous output with 55°C ΔT l/h 406 649 1034 1392 1568
Storage capacity litres 324 312 265 265 265
Maximum operating water pressure (open vented) bar 8 8 8 8 8
Maximum operating water pressure (unvented) bar 3.5 (=cold feed pressure reducing valve preset in unvented kit
option)
Expansion relief valve setting (open vented kit) bar 5 5 5 5 5
Energy Building Regulations thermal efficiency gross % 82.31 81.11 81.15 80.15 80.20
Heating-up time, ΔT = 44°C min. 38 23 12 9 8
Heating-up time, ΔT = 50°C min. 43 26 14 10 9
Heating-up time, ΔT = 55°C min. 47 28 15 11 10
Standby losses kW/24h 9 10.4 8.3 9.0 9.9
Gas Nat. Gas
G20-20mbar
Input power, gross-maximum kW 31.6 51.2 81.6 111.1 125.2
Output power-maximum kW 25.9 41.5 66.2 89.0 100.3
Gas inlet pressure-nominal mbar 20 20 20 20 20
Gas flow rate-maximum@1013.25 mbar and 15°C m3/h 3.1 5.0 7.9 10.8 12.2
LPG
G31-37mbar
Input power, gross/ (net)-maximum kW 29.9 47.0 75.7 108.7 n/a
Output-maximum kW 25.0 38.9 62.6 89.0 n/a
Gas inlet pressure-nominal mbar 37 37 37 37 n/a
Gas flow rate-maximum@1013.25 mbar and 15°C kg/h 2.2 3.4 5.5 7.9 n/a
Flue Approximate flue gas volume @15°C, 9.8% CO2,
N.T.P. (nat. Gas-G20)
m3/h 39.3 63.4 100.2 137.0 154.8
Flue gas temperature-maximum °C 130 150 145 180 185
General Power consumption-DR-SE (DR-SA) W 100 100 100 275 300
Electrical supply Vac 230V 1Ph 50Hz  
Weight when empty kg 230 245 295 320 320
Approximate shipping weight kg 235 250 300 325 325
Maximum floor load/weight filled with water kg 554 557 560 585 585
 
  Title Type Size