Solar thermal

[zeljuga]

Jason you have combination of different options with existing cylinder, yours call which way you wont to go .
External heat exchanger with ad on pump and controls, or plug coil, or new ad on cylinder. Legionella problem can be easily treated with once a day heating to 65 c.if not enough heat is delivered on given day from the thermal panels. Good quality controller, connecting all parts together in one smooth working system its essential.
Your crucial issue it`s good insulation of the existing cylinder as heat los/24h for 200l cylinder starts from 2.4 kw/24h for good insulated cylinder , and goes to 8-9 kw/24h loss on most traditionally insulated cylinders. which in terms owe ride benefits of dumping excess El. power from PV system in to the hot water cylinder. Each time you convert energy from one type to the other proportionally high losses inure.
Anyway . Couple connections for heat exchangers and plugs.
Heat Exchangers
Retrofit

 

[jason121]

Pipes every where

 

[Gavin A]

seriously, check out the solartwin / thermatwin panel for that, you'll probably be able to just tap in to the pipework in the loft and stay away from that mess - though you might need to insulate some of the pipework.

ask for a trade account mind

 

[Earthstore]

View attachment 18632View attachment 18633Pipes every where

Nice bit of tape around that joint.
So why are you going for Solar thermal and not PV?

 

[jason121]

Customer heating bill is costly on oil. Electric consumption small in comparison to heating bill. Small roof has some shade.

 

[jason121]

seriously, check out the solartwin / thermatwin panel for that, you'll probably be able to just tap in to the pipework in the loft and stay away from that mess - though you might need to insulate some of the pipework.

ask for a trade account mind

Gavin what is solartwin ?

 

[Gavin A]

Gavin what is solartwin ?

ThermaTwin Solar Panels - DiscreteHeat UK

that's the new name for it, it's been around for a long time but they used to charge a fortune and only really supply and fit, went bust and now taken over by a company who only want to wholesale it to installers or DIY.

Essentially it uses freeze tolerant pipes in the panel, so it actually pumps the water direct through the panel itself without a heat exchanger, so takes cold from the base of the tank (though can be anywhere on the cold supply from the header to the tank) and pumps that through the panel, then dumps hot water in the top of the tank (though the connection point can be anywhere between the loft-top of the tank via the expansion pipe).

The installs were a bit micky mouse from the ones I've seen, but can be done better by professionals with a bit of care IMO, and without the costs of a new cylinder, glycol, electrics (it runs off a little PV panel) etc the cost can be around a grand lower and the payback time is that much quicker.

 

[jason121]

Thanks guys for all your input much appreciated.