Self adjusting valves operated on auxiliary energy; regulating device with or without shutting-off (zero-shut-off), class R<(Index)m> and R<(Index)o>— 2 стр.
Gas-fired storage water heaters for the production of domestic hot water (including Amendment A1:1999 + A2:2000); German version EN 89:1999 + A1:1999 + A2:2000— 66 стр.
Gas-fired storage water heaters for the production of domestic hot water (including Amendment A1:1999 + A2:2000); German version EN 89:1999 + A1:1999 + A2:2000— 66 стр.