Soldato
The Vaillant tank is very well insulated. It's definitely not ideal from an overall efficiency perspective, but really the leakage to ambient is not that much and was worth it to free up space. All I have in the house is a manifold behind a false panel in the cupboard. So far performance of the system has been very good. House is comfortable all the time and we seem to be using about 13kw per day in the current weather.I didn't think putting the tank in the loft would be recommended? Our loft is effectively always at outside air temperature thanks to the insulation doing its job and keeping the heat in the house - so a hot water tank sat at nearly 0ºC ambient temperature seems a little... inefficient?