Just Dave
New Member
Newbie here, hi all.
A little background, we have gas warm air heating fitted in the 60's when the house was built. It was just replaced with a newer model that has a built-in water heater that can put out about 3.3Kw/h, either to gravity fed or pumped to a tank.
On the roof we have grid-tied 7kw/h PV panels along with batteries. I would like to put a further 1.5Kw/h worth of panels on the only other piece of the roof where they would be viable, this would be used solely for heating water via immersion heating. (I did look into air source but it wasn't going to be possible).
I also looked at solar thermal panels but for several reasons I've had to rule them out.
I have 2 stainless steel unvented tanks although I won't be using them with mains pressure, so more as thermal stores. The mains water would be passed through an external heat exchanger before routing to the taps. The lower tank on the 1st floor is heated (by gas) and should only be required for a few winter months a year, the higher tank should be sufficient for the rest of the year. The higher tank is predominantly heated by 2 immersion elements (one solar only/ one solar + grid).
Take a look at the drawing, what are your thoughts? I was hoping gravity feed might eliminate the requirement of 2 pumps? This is a first drawing so bound to have missed out stuff, please see what looks wrong...
A little background, we have gas warm air heating fitted in the 60's when the house was built. It was just replaced with a newer model that has a built-in water heater that can put out about 3.3Kw/h, either to gravity fed or pumped to a tank.
On the roof we have grid-tied 7kw/h PV panels along with batteries. I would like to put a further 1.5Kw/h worth of panels on the only other piece of the roof where they would be viable, this would be used solely for heating water via immersion heating. (I did look into air source but it wasn't going to be possible).
I also looked at solar thermal panels but for several reasons I've had to rule them out.
I have 2 stainless steel unvented tanks although I won't be using them with mains pressure, so more as thermal stores. The mains water would be passed through an external heat exchanger before routing to the taps. The lower tank on the 1st floor is heated (by gas) and should only be required for a few winter months a year, the higher tank should be sufficient for the rest of the year. The higher tank is predominantly heated by 2 immersion elements (one solar only/ one solar + grid).
Take a look at the drawing, what are your thoughts? I was hoping gravity feed might eliminate the requirement of 2 pumps? This is a first drawing so bound to have missed out stuff, please see what looks wrong...
