Zero emission home heating and hot water Available in the UK from 2024, cylo from Remit Zero is an emission-free replacement for domestic, gas and oil-fired boilers. Easy to install, run and maintain, it requires no building fabric upgrades, larger radiators or significant plumbing changes.cylo draws only the cheapest, cleanest electricity and stores it as heat until it's needed, providing hot water on demand for radiators, taps and showers. With the same functionality and familiar output temperatures of a gas or oil boiler, but in a simpler, safer, solid-state, cylo will benefit from a decades-long operational life.