The best replacement for unvented is thermal store.

The best alternatives to unvented are rated as following:
★★★★★  thermal store
★★★★  vented cylinder
★★★★  vented gas logs
★★★★  vented
★★★  combi
★★  vented gas fireplace
★  vented fireplaces
★  vented water heater
★  vented system
★  vented range hoods
  vented crawl space

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unvented
thermal store
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