A warranty is a representation by the policyholder that certain conditions exist or will be met. Even if the warranty is not in writing, it may exist as an “implied” warranty, for example, that a building is not on fire when insured, or that a vessel is seaworthy.
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UK: A warranty which by law is tacitly understood to be binding and does not have to appear in the policy. The Marine Insurance Act 1906 (ss.39, 41) implies: (a) that under a voyage policy the vessel will be seaworthy at the commencement of the voyage; and (b) the legality of the insured adventure. In a voyage policy on goods or other moveables there is a further implied warranty at the commencement of the voyage that the ship is reasonably fit to carry the goods, etc., to the intended destination (s.40).
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Warranty which, though not stated in words in an application for Insurance, is assumed to be true, at least as an affirmative warranty. Though rare outside ocean marine Insurance, an implied warranty in property Insurance is that the insured believes the property is not now being destroyed.