The lifeboat was damaged beyond economic repair after her moorings snapped during severe storms in March. The lifeboat, John Neville Taylor, from the charity's relief fleet has been allocated to the town permanently.
The new lifeboat is seven years old, six years younger than the Sir Ronald Pechell Bt, has been refitted, at a cost of £170,000 in preparation for her relocation to Dunbar. The local RNLI lifeboat crew will collect her from Poole this week.
The RNLI says it has been overwhelmed by the support from the local community and will be allocating money people wish to donate to the new Dunbar lifeboat to cover the cost of the refit.
John Caldwell, RNLI divisional inspector Scotland, says: "We are extremely grateful to all the volunteers at Dunbar station for their dedication during this time and for the support of the local community. We can now confirm that a seven-year-old Trent class lifeboat from our relief fleet will be placed in Dunbar permanently.
"The atrocious weather conditions on Saturday, March 22, put a tremendous amount of pressure on the mooring causing it to snap. The lifeboat was smashed against the rocks damaging her beyond economic repair. All equipment and materials which can be reused will be removed from the Sir Ronald Pechell Bt to help maintain the Trent class lifeboat fleet."
The RNLI said the decision to place one of the relief lifeboats in Dunbar was made possible thanks to efficiencies achieved in the maintenance of the Trent fleet. Trent class lifeboats have a life expectancy of 20-25 years.
The RNLI has also expressed further thanks to the volunteer Coastguards, staff from Torness Power Station, Lafarge Cement Works and Coastal Marine (Eyemouth) who worked with volunteer lifeboat crew and helpers from the early hours of Saturday 22 March to ensure the safe recovery of the Dunbar all weather lifeboat avoiding any environmental damage.
The value of the Sir Ronald Pechell Bt was £1.05 million when it was built in 1995 and with depreciation its current value is £208K. A £600K legacy from Lady Dora Pechell in memory of Sir Ronald Pechell funded the Dunbar all-weather lifeboat. The remainder was paid for by a Dunbar appeal (c. 1985-1994) and other legacies.
The Dunbar all-weather RNLI lifeboat is moored at Torness as there is not always enough water depth in Dunbar Harbour to allow the launch of the all-weather lifeboat and for it to get out of the narrow harbour. As the RNLI needs an operational lifeboat in this area, the next best thing for this location is a mooring. The Torness mooring has been in use since 1997. The berth in Dunbar Harbour is only tenable over neap tides.
The Trent class lifeboat is designed to lie afloat, either at deep-water moorings or at a berth. Introduced in 1994, it shares the same hull shape as the Severn class but is a smaller version at 14m in length.
Constructed of fibre reinforced composite it can reach speeds of 25 knots and has a rnage of 250 nautical miles.