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The payback period is shorter given greater insolation. However, even in temperate areas, solar water heating is cost effective. The payback period for photovoltaic systems has historically been much longer. [52] Costs and payback period are shorter if no complementary/backup system is required. [51] thus extending the payback period of such a ...
The new revisions bring the code up to date with methodology developed in the new CDM 2007 regulations and also the requirements of the new European codes EN 12811-1:2003 Temporary works equipment - Part 1: scaffolds, and EN 12812:2004, falsework - performance requirements and general design.