Are HETAS and OFTEC the same? A guide for homeowners

HETAS and OFTEC are two distinct UK competent-person schemes, not interchangeable qualifications, and understanding the difference matters before commissioning any combustion appliance installation. This article explains what each scheme covers, where their remits overlap, and how to confirm your installer holds the right certification for the work.

Are HETAS and OFTEC the same?

Both schemes authorise registered installers to self-certify eligible domestic work under Building Regulations, but they are separate organisations with different specialist scopes. For solid fuel and biomass appliances, both are recognised; for oil-fired heating equipment, only OFTEC applies. The distinction lies in fuel type, not in the general principle of self-certification.

How HETAS and OFTEC registration differs

A trade professional asking are HETAS and OFTEC the same will find that both sit within the competent person scheme framework under Building Regulations, yet each organisation was established with a different primary remit. HETAS focuses on solid fuel and biomass heating, while OFTEC spans oil-fired systems and solid fuel work as well.

• Solid fuel and biomass Both HETAS and OFTEC are authorised competent-person schemes for solid fuel combustion appliances, including wood-burning stoves, multi-fuel stoves, fireplaces, flue systems and chimney liners, meaning an installer registered with either scheme can legally self-certify this category of work.
• Oil-fired appliances OFTEC is the authorised scheme for oil and liquid-biofuel combustion appliances, including oil boilers and associated heating controls; HETAS holds no authorisation for this category, making OFTEC the only route for oil-heating self-certification.
• Electrical and plumbing scope Beyond combustion work, HETAS is also authorised for plumbing and water supply systems, while OFTEC extends to electrical installations in dwellings, differences that reflect how each organisation's registration scope has evolved to support its installer base.

Installers are registered for specific categories of work, and your installation compliance depends on confirming that the scope held by your chosen engineer matches the appliance and fuel type being fitted. Compliance documentation demonstrates this: customised HETAS and OFTEC data plates can display both scheme registrations side by side for the installer's scope.

HETAS for stoves and fireplaces

HETAS is a not-for-profit organisation that operates as the only competent-person scheme specialising solely in biomass appliances and solid fuel heating. A HETAS registered installer working on a wood-burning stove, multi-fuel stove or fireplace can notify the local authority on the customer's behalf and self-certify compliance with Building Regulations, so the homeowner receives a Building Regulation Compliance Certificate without arranging a separate building control inspection. HETAS also provides technical guidance on flue systems, including a strong recommendation to line chimneys in pre-1964 properties where exposed brickwork frequently fails smoke tests, a detail that affects both the installation specification and ventilation design from the outset.

OFTEC registration for solid fuel and oil

OFTEC registered installers can certify solid fuel burning and oil-fired work, making OFTEC the broader scheme in terms of fuel coverage. For solid fuel work specifically, OFTEC offers two qualifications: OFT15-108(D) covers the installation, commissioning and servicing of dry space-heating appliances, while OFT15-108(W) extends to space and hot-water heating and requires OFT15-108(D) as a prerequisite. Qualifications older than five years must be retaken before registration, ensuring that OFTEC solid fuel competence remains current.

Beyond individual qualifications, OFTEC registration includes a six-month workmanship warranty covering installations that fail to meet Building Regulations requirements if the original installer is no longer trading, a consumer protection that sits alongside the self-certification route. The installation of solid fuel appliances via an OFTEC-registered engineer follows the same notification process as HETAS. For oil boilers and associated heating equipment, only OFTEC provides this self-certification route; there is no HETAS equivalent.

Certificates, compliance and selling a home

Compliance documentation produced under either scheme becomes part of the permanent property record. Conveyancers and buyers' solicitors routinely request it, so its absence can delay or complicate a sale. For gas appliances, the installer must be gas safe registered rather than HETAS or OFTEC certified, a separate legal requirement that applies regardless of the fuel used for any solid fuel appliance already present in the property.

• Retain all documentation The compliance certificate should be kept with the appliance manual, warranty details and any flue paperwork; these together form the complete installation record that future occupants and installers will need.
• Carbon monoxide alarm The 2022 amendments to Approved Document J introduced a mandatory CO alarm requirement, complying with BS EN 50291 and positioned between 1 m and 3 m horizontally from the appliance; this applies to replacement stoves in existing dwellings, not only new builds, and the certification documentation should confirm it.
• Data notice plates Bespoke data notice plates for combustion appliances can be personalised with HETAS and OFTEC registration details alongside installer branding; prices start from £1.54 per plate with bulk discounts available, and the OFTEC certificate or HETAS registration number can be printed directly onto the plate for a fully compliant installation record.

The stove flue regulations compliance guide sets out Approved Document J and self-certification routes for trade professionals managing their own certification processes.

Frequently asked questions

Does a wood-burning stove installation need a HETAS certificate?

Not exclusively. HETAS is the only competent person scheme specialising solely in solid fuel and biomass work, but OFTEC is also an authorised scheme for solid fuel combustion appliances. An installer registered with either scheme can legally self-certify a wood-burning or multi-fuel stove installation under Building Regulations. What matters is that the engineer holds a current, in-scope solid fuel registration: the difference between HETAS and OFTEC does not determine legality for this category of work, only the organisation administering the scheme.

Is an OFTEC registration a legal requirement for oil boiler work?

For oil-fired appliances and liquid-biofuel heating equipment, OFTEC is the only authorised competent person scheme listed under Building Regulations. An installer who is not OFTEC registered cannot self-certify an oil boiler installation; the homeowner must instead submit a building notice to the local authority, pay the applicable fee and arrange staged inspections before a completion certificate is issued. As a result, engaging an OFTEC registered engineer for oil heating systems is the most straightforward route to documented compliance and avoids delays at the point of sale.

Can a property be sold without a compliance certificate for a log burner?

Technically, a sale is not automatically blocked, but the absence of a Building Regulation Compliance Certificate is a material fact that solicitors and buyers are likely to raise. Where no certificate exists because the installation was not notified to the local authority or carried out by a registered installer under a competent person scheme, the local authority retains no compliance record. Buyers may require a retrospective inspection, a reduction in price or an indemnity policy. The original installation determines the paperwork trail; retrieving documentation years later is considerably more complex than retaining it at the time.