FAQ

A 'host' is the household with the heata unit installed on their hot water cylinder.

How much hot water does a heata unit provide per day?

At expected utilisation levels the heata unit will deliver ~3.6kWh of hot water per day. This is approximately 80% of the hot water requirements of an average UK household.

What kind of carbon saving does the heata unit offer?

Each heata unit saves approximately 1 tonne of carbon dioxide per year, vs a typical data centre + household heating.

How much can a host save per year?

Based on average household hot water yearly usage (water heated using electricity not gas), the host could save up to £200 / year at an electricity price of 0.144p / kWh.

Who pays for the electricity and how do you know how much electricity the heata unit uses?

Heata pays for the electricity to run the device, not the host. The electricity used by the unit is metered (the host can see the meter reading on the power supply unit) and the host's utility account is credited for the amount used.

What is the projected EPC improvement?

We estimate that the heata unit will improve the EPC rating by 4-8 points depending on the primary heating system. We are going through the SAP process with BRE in 2023-2024 to confirm the number of points.

Does the heata unit replace the host’s boiler or immersion heater?

No, the heata unit will provide a base load of hot water; approximately 80% of an average household’s hot water requirement. The host’s current hot water heating system stays in place and will provide top-up heat as required / per their central heating controls.

Does installing a heata unit invalidate my cylinder's warranty?

The installation procedure is a larger version of how a standard tank stat is installed. We’ve tested the installation process with a British Gas engineer, and spoken to a leading cylinder manufacturer who confirmed that following the approved installation process won’t invalidate a cylinder's warranty.

Is a plumber needed to install the heata unit?

No, an electrician fits the heata unit to the outside of the hot water cylinder and it doesn’t need to be plumbed in. This simplifies installation, and avoids the ongoing liabilities of problems associated with any plumbing work.

Does adding a heata unit change the energy efficiency rating of the cylinder?

No, whilst the unit is installed it will be always on, giving heat to the cylinder. When decommissioned, a plug / cap of equal or greater thermal resistance will cover the hole.

Does the size of the unit prohibit its installation in tighter spaces / airing cupboards?

Yes, in some cases it won’t be possible to install the unit. It is something we’ll manage carefully as part of the initial pre-installation process.

What happens when something goes wrong with a heata unit?

The host doesn’t lose any hot water as their existing heating will continue to function. The repairs team is notified automatically and they will be in touch to arrange a time to replace the unit. Once initial installation has been completed, repairs and updates are relatively quick as the unit is simply bolted to the mounting plate that is already in place on the cylinder.

How often will an engineer need access for maintenance?

We schedule a yearly maintenance visit, much like a yearly boiler service to maintain your Gas Safety Certificate.

What is the lifespan of the unit?

Like most computer hardware, being outdated / unprofitable to run (perhaps 4 years) tends to happen before failure, a swap to new hardware will take about 30 minutes.

Does the heata unit use the host’s broadband?

Connectivity is flexible, we can use the host's broadband but plan to install dedicated fibre or 4G / 5G connections.

Will the unit interfere with other wireless equipment installed in the house?

The unit has passed EMC testing, which means that it won't affect the host’s electronic equipment, including WiFi.

Does the unit produce any noise, if so what dB?

The heata unit uses variable speed low noise air circulation fans, no louder than 30db (a whisper) at max speed.

Can the host use the processing power of the heata unit?

No, the computer processing is used and paid for by companies who want to process their data more sustainably - it’s a lovely story for them to know that their compute doesn’t require air conditioning and is providing free hot water for a household.

What safety measures are in place to prevent the unit or water from overheating?

There are 4 levels of overheat protection:
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1. All processors throttle their speed (and therefore power output) when they reach their max operating temp.
2. The machine will monitor the case and water temperature on the machine and reduce work accordingly.
3. There will be an auto reset-able thermal switch in the unit, which will temporarily cut the power to the unit if the above measures fail.
4. There will be a non auto reset-able thermal cut out as a back-up to the above device.

3 and 4 are as those found in standard immersion heaters, so as to comply with EN60335-2-73 (National Safety Standards).

Will the water get hot enough to prevent pathogens?

There is no additional risk from the unit, as the primary water heating system is still active. If anything, with better monitoring we'll be able to identify problems that might stop the water getting sufficiently hot to prevent the development of pathogens.

Could a host gain access to the heata unit?

There are chassis intruder alarms, and all peripherals are disabled and physically inaccessible. The storage within the heata unit is LUKS / AES-256 fully encrypted and inaccessible if removed from the heata unit.

How secure is the heata network - can the heata unit see what the household is accessing and viewing online?

Very secure, we’re working with SUSE, leveraging their secure edge platform, providing enterprise grade security in physically exposed public infrastructure. E.g. Mobile base stations. Heata units are on a private subnet, isolated from the host’s network and all network traffic goes out through a VPN (AES-256 encrypted) to the wider internet, so the host’s home network is completely inaccessible to compute workloads and vice-versa.

If the unit is removed what happens to the area without insulation?

A plug / cap of equal or greater thermal resistance will cover the hole, the cylinder's warranty is unaffected.

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