I think nostr:nprofile1qqsy6q3ua80awknlxp6m368qssqghct6ra6scca4meepumhcswkuwegppemhxue69uhkummn9ekx7mp0qyghwumn8ghj7mn0wd68ytnhd9hx2tcpzamhxue69uhkummnw3ezumn0dahx2uewvdhk6tc8vdatl built a great water heater system. I plan to build something similar but bigger to allow for a radiant floor loop also in my long term plans. Basically silent by going submerged with heat exchangers.