Looks nice John.
We considered Wamsler, but went with Esse in the end.
Is your house one story? Ours is two story and we were able to set up the stove to thermo-syphon so no pump required.
If one story, you will need a sensor to kick the pump on when the
water gets hot, and turn it off when not required. We have this as a safety precaution anyhow because of the complexity of our system. If we lose power we have to be careful with how we stoke the fire (or run a bath quickly!).
Maybe they build a controller with the sensors all built in?