Heatbit's Bitwater turns the heating elements of a household water heater into Bitcoin (BTC) miners, with the device priced at $899, according to a COINOTAG report published on October 25, 2026.

The product follows the core concept behind Heatbit's existing line of heater-miners: the processors that secure the Bitcoin network convert nearly all of the electricity they draw into heat, so hardware designed for a heating function can mine BTC as a byproduct while performing its primary task. Heatbit has previously marketed electric heater units, including the Heatbit Trio, that are designed to offset part of their operating cost with mining revenue. As with any mining hardware, that revenue is not fixed: it moves with bitcoin's market price and with network difficulty, which the Bitcoin protocol adjusts roughly every two weeks in response to shifts in total hashing power.

Water heating represents a significant share of household energy consumption, and routing the waste heat from mining hardware into domestic uses such as space heating and hot water has been a recurring niche within the bitcoin mining industry. Devices in this category are typically evaluated on how much of the heating value they deliver alongside the mining revenue they generate. In setups like Bitwater's, electricity purchased for warmth effectively serves two purposes at once — a framing the heat-reuse segment has used to long-running criticism of proof-of-work mining's energy intensity. The economics of such a unit hinge on details the initial report did not specify, including hash rate, power draw, and how mining payouts are handled.

Update, 15:22 UTC: COINOTAG reported that with mining running around the clock, power curtailments eroded hash revenue, Microfin stopped paying bills in May 2025 and accrued roughly $5 million against monthly invoices of about $2 million before settling in December.

This article was first published on COINOTAG.