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I am looking at adding a Heatstore and an Immersion type device whilst I am redoing my two bathrooms this summer. The position is: Currently I have a big solar array (10kWh, generating approx 550 kWh per year due to E/W alignment and a measure of shading) No Immersion diverter as I have no convenient heat sink. Big combi boiler (Worcester Bosch Classic Range - the biggest model). Not relevant, but modulates down to 35C. The boiler is quite new - 2-3 years. Combined UFH/radiator downstairs/upstairs heating driven from the combi. But no buffer tank in the heating system. 2 x elecric shower, 1 x shower, bath etc driven off the gas. No problems on space in the Consumer Unit etc. Most of the plumbing is in the right places, and I do not plan t be digging too many holes in walls apart from the bathrooms. Current bills are more or less £1000-1200 a year - half gas, half electric. Showers are used everyday, bath several times a week. Mainly use the gas powered shower. I am thinking about: Adding a heatstore and immersion or i-Boost, to make better use of the solar. Putting in provision for a buffer in the ufh, which willrequire inserting a couples of pipe runs in one of the bathroom refurbs. I can see that in the future I may wish to replace the boiler with a ASHP - space is available for that. Questions: Can I use a heat store in a straightforward way in this arrangement? eg can one be used to preheat water to the combi like a Sunamp? I am aware that a Divert-device will be about £500 installed, and should potentially give me £150-200 of electricity a year (perhaps), which would replace perhaps £60-75 of gas. What bill am I facing for a potential heat store? I estimate I would want one that would do 1-2 days usage. There are currently 2 here but it is potentially a house with 3-4 or a family. Am I missing any tricks? Really I am trying to think about what can usefully be done at the same time as bathrooms. All comments will be gratefully received, as thus is not an area where I have good gut-feel? (Potentially I can move some solar to the South to get better performance, but that requires me to get a car-port past the authorities - which will not happen any time very soon) Cheers Ferdinand