Earth Notes: Reconnecting the Heat Battery (2025-02)

Updated 2025-02-21.
Summer solar hot water from our PV again. #solar #DHW #PV
Before the heat pump was installed at the end of the Sunamp Thermino heat battery was disconnected. All DHW was been provided by the heat pump and its DHW cylinder. As of we are starting to get sunny days where we could capture some 'excess' PV generation that would otherwise spill back to the grid, and instead divert it via the Myenergi Eddi to the Sunamp Thermino to provide almost all our DHW locally for about six months of each year.

2025-02-21: Getting Started

DM arrived at ~ to start the reconnection works.

We spent maybe a couple of hours looking at the manufacturers' instructions (MI) and the various system schematics to hand including my diagrams of how I think things ought to end up. We have come up with a sketch that we agree on of how things ought to work, and a shopping list of 6 isolator valves and a pressure-relief valve (PRV).

20250221 Thermino reconnection first sketch
Initial sketch (by DM) after a couple of hours of discussion. Also see the Thermino and heat pump systems diagrams.

A feature of this setup is that the Thermino and Intasol can be isolated, and normal vanilla DHW operation with the heat pump only can be restored.

At I powered off the heat pump at its dedicated supply panel until .

The water was off for a while too while some of the pipework was reconfigured.

The plumbing was not quite completed today. The various isolation valves have been set to 'vanilla' heat-pump only DHW. Electrical and networking and outside tidy-up/screening works remain.

(We did get a separate plumbing problem under the kitchen sink fixed in passing today, as a bonus of having a grown-up on site...)

IN PROGRESS