[toast0]

> and if that would ‘pay for itself’ (environmentally well as financially) after a couple of years.

At 11W, the financial costs of running are quite low. I think it's about 90 kWh per year. Depends on your rates, but I've seen $0.60 quoted in comments lately as a high rate for PG&E customers in California, which is about $55. You might well be able to invest in something that can run your load for fewer watts, but I don't know if it's worth the effort.

You're likely to get a lot more savings by looking at things that use more energy.