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A direct-fired heater burns the fuel directly in the airstream that's blown into the workspace — high efficiency (95%+) because no heat is lost to a heat exchanger, but the combustion by-products (carbon dioxide, water vapour, trace contaminants) end up in the workspace, so direct-fired heaters are restricted to well-ventilated and outdoor applications. An indirect-fired heater seals the combustion chamber and uses a heat exchanger to transfer heat to a separate clean airstream — lower efficiency (around 80%) but the heated air is clean, suitable for indoor and confined-space use.

Approximate fuel consumption scales linearly with output. A 30 kW diesel or kerosene heater consumes roughly 2.5-3 litres of fuel per hour at full output. Tank capacity determines run-time — a 50-litre tank gives roughly 16-18 hours of continuous run at full output, longer at part load. Each heater's tank capacity and consumption rate are listed on the product page; calculate run-time by dividing tank capacity by consumption rate.

Most diesel heaters are rated to run on standard road-grade diesel (DERV); agricultural use of red diesel (28-second gas oil) is permitted in agricultural buildings under HMRC rules where the heating is for an agricultural purpose. Always check the heater manufacturer's fuel-grade specification — some heaters require kerosene 28-second specifically and may not run reliably on DERV diesel due to viscosity differences. The product page lists rated fuel grades.

Annual service is the manufacturer recommendation for most liquid-fuel heaters — typically before the heating season starts. Service includes: replace the fuel filter, replace the spark plug or ignition electrode, clean the burner nozzle, check the photo-cell flame sensor, and inspect the combustion chamber and heat exchanger for soot accumulation. Replacement service kits and individual parts are available for the majority of SIP and Sealey heaters.

Returns are accepted within 30 days of purchase, in original packaging, on orders delivered within the United Kingdom. For damaged-on-arrival items, report within 24 hours with photographs to [email protected] — we will typically arrange collection and replacement at no cost to you. For parts that don't fit your machine, the Fit Guarantee covers a hassle-free return at no cost. For buyer's remorse — you've changed your mind or ordered the wrong item, email us first to obtain a Return Merchandise Number; a restocking fee may apply. Refunds are issued to the original payment method once the return is inspected.

Delivery time depends on the product, your destination, and availability — the estimated time for any item appears on the product page, and 'Check where we deliver' confirms coverage for your postcode before you order. Next-day delivery is available on most products; the option appears at checkout when applicable. We deliver across the UK, Europe, the Middle East, and Africa. Use the country selector at checkout to confirm coverage and delivery options for your destination.

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Diesel Paraffin Kerosene Heaters

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Within Heating, Diesel, Paraffin & Kerosene Heaters covers the high-output liquid-fuel heaters used in industrial workshops, agricultural buildings, construction sites, and large open-sided spaces where the heating demand exceeds what electric or propane heaters can practically provide. These heaters burn diesel, paraffin (kerosene 28-second), or kerosene to generate high heat output from a fuel source that's compatible with the wider yard fuel logistics on most plant-equipment sites. Parts For Machines supplies diesel, paraffin, and kerosene heaters across direct-fired (the combustion gases mix with the heated air) and indirect-fired (combustion is sealed; only clean heated air is blown into the workspace, with combustion gases vented separately) designs.

Direct-fired heaters are simpler, cheaper, and more efficient but can only be used in well-ventilated or outdoor applications. Indirect-fired heaters are larger, more expensive, but produce clean heated air suitable for indoor and confined-space use. Parts For Machines is an Authorised Distributor and Seller of SIP and Sealey across the diesel, paraffin, and kerosene heater range.

Both brands carry the standard direct-fired space heaters in mid-range outputs (typically 15-50 kW), with Sealey extending into the larger indirect-fired range used for industrial and agricultural applications. Clarke and Rhino extend the range with workshop and agricultural heaters at competitive trade pricing.

Product pages list heat output (in kW or BTU/hour), fuel type and consumption rate (typical liquid-fuel heaters consume 1-5 litres per hour at full output), tank capacity and run-time at typical load, area coverage estimate, and ventilation requirements. Diesel and paraffin heaters require fuel handling — Product pages list the recommended fuel grade and any fuel-additive recommendations. Trade pricing on multi-unit and fit-out orders is available; contact the team via WhatsApp 07754288583.

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FAQs

A direct-fired heater burns the fuel directly in the airstream that's blown into the workspace — high efficiency (95%+) because no heat is lost to a heat exchanger, but the combustion by-products (carbon dioxide, water vapour, trace contaminants) end up in the workspace, so direct-fired heaters are restricted to well-ventilated and outdoor applications. An indirect-fired heater seals the combustion chamber and uses a heat exchanger to transfer heat to a separate clean airstream — lower efficiency (around 80%) but the heated air is clean, suitable for indoor and confined-space use.

Approximate fuel consumption scales linearly with output. A 30 kW diesel or kerosene heater consumes roughly 2.5-3 litres of fuel per hour at full output. Tank capacity determines run-time — a 50-litre tank gives roughly 16-18 hours of continuous run at full output, longer at part load. Each heater's tank capacity and consumption rate are listed on the product page; calculate run-time by dividing tank capacity by consumption rate.

Most diesel heaters are rated to run on standard road-grade diesel (DERV); agricultural use of red diesel (28-second gas oil) is permitted in agricultural buildings under HMRC rules where the heating is for an agricultural purpose. Always check the heater manufacturer's fuel-grade specification — some heaters require kerosene 28-second specifically and may not run reliably on DERV diesel due to viscosity differences. The product page lists rated fuel grades.

Annual service is the manufacturer recommendation for most liquid-fuel heaters — typically before the heating season starts. Service includes: replace the fuel filter, replace the spark plug or ignition electrode, clean the burner nozzle, check the photo-cell flame sensor, and inspect the combustion chamber and heat exchanger for soot accumulation. Replacement service kits and individual parts are available for the majority of SIP and Sealey heaters.

Returns are accepted within 30 days of purchase, in original packaging, on orders delivered within the United Kingdom. For damaged-on-arrival items, report within 24 hours with photographs to [email protected] — we will typically arrange collection and replacement at no cost to you. For parts that don't fit your machine, the Fit Guarantee covers a hassle-free return at no cost. For buyer's remorse — you've changed your mind or ordered the wrong item, email us first to obtain a Return Merchandise Number; a restocking fee may apply. Refunds are issued to the original payment method once the return is inspected.

Delivery time depends on the product, your destination, and availability — the estimated time for any item appears on the product page, and 'Check where we deliver' confirms coverage for your postcode before you order. Next-day delivery is available on most products; the option appears at checkout when applicable. We deliver across the UK, Europe, the Middle East, and Africa. Use the country selector at checkout to confirm coverage and delivery options for your destination.

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