One concern is having the space to install such a system as it normally goes underneath your garden. Another major factor in the effectiveness of it is the current U value of the property, if it is well insulated then it may be a consideration but if, for instance, there is no cavity insulation or minimal loft insulation then the costs of inatallation will never be recovered in fuel savings but more importantly the project may not produce enough heat in the first place as what output there should be would be lost through the walls and roof!!
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