56ad292d-b2a0-474b-b51d-e9f45724dcfe 1 boiler to produce either 20, 25 or 30 kW of heating and domestic hot water production, according to the reference usage scenario defined in the EN 15502 -1 standard and during the 17 year reference lifetime of the product Vaillant Group UK Ltd. 2026-09-28T12:26:56Z 00.00.003