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Hollow vs solid oil burner nozzle

Updated: 22 October 2026

The carton in your hand says full cone, the old jet says EH, and a cheaper listing at the same flow says solid. Hollow versus solid is the pattern question, not a quality grade. This hollow vs solid oil burner nozzle guide uses Danfoss naming, the City Plumbing pattern language and the amazon.co.uk rows in the [oil burner nozzle comparison](/hub/heating/oil-burner-nozzle). Peter F. checked those sources on 20 October 2026. A qualifying purchase can earn a commission at no extra cost to you. We did not spray these jets in a lab. Know when hollow is what the plate already chose, when solid is the correct spare, and why a solid cone B title is not a quiet upgrade.

The carton in your hand says full cone, the old jet says EH, and a cheaper listing at the same flow says solid. Hollow versus solid is the pattern question, not a quality grade.

Our top picks

Danfoss Danfoss 0.60 × 80 EH

Best overall

Danfoss Danfoss 0.60 × 80 EH
9.8/10about £12.91
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Danfoss Danfoss 0.65 × 60 ES

Rank 2

Danfoss Danfoss 0.65 × 60 ES
9.4/10about £14.00
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Danfoss Danfoss 0.65 × 80 EH

Best value

Danfoss Danfoss 0.65 × 80 EH
9.4/10about £13.00
View offer
On this page
  1. 1.How Danfoss names spray patterns
  2. 2.Hollow patterns
  3. 3.Solid and semi-solid patterns
  4. 4.Choosing for your plate
  5. 5.Symptoms when the pattern is wrong

How Danfoss names spray patterns

Danfoss sorts nozzles by where the oil sits in the cone. S or ES is solid. H or EH is hollow. B is semi-solid. Hollow loads the edge. Solid fills the cone more evenly. The extra E is the fuel family, on the kerosene oil burner nozzle page. EH and ES are the kerosene nozzles, marked to OFTEC OFS E100, mainly at 60° and 80°, with capacity at 8 bar. H, S and B are the wider family, with kg/h at 10 bar. Full cone does not name the letter. Read the three marks in the oil burner nozzle buying guide.

Hollow patterns

A hollow cone leaves the middle lean and loads the outer ring. On kerosene the house plate usually says EH, not bare H. The Danfoss 0.60 × 80 EH at £12.91 (part 030H8312) prints 1.80 kg/h, the City Plumbing figure for 0.60 at 8 bar. The 0.65 × 80 EH at £13.00 (part 030H8314) has reviews that name a kerosene Rayburn and a Grant Vortex. Bare H is a different family. The £19.95 0.45 × 80 H (part 030H8906, 4.8 from 13 reviews) is the wrong hollow if the plate says EH. An 80° jet on a 60° head changes the width of the spray.
Danfoss Danfoss 0.60 × 80 EH

Testsieger

Danfoss Danfoss 0.60 × 80 EH
9.8/10about £12.91
View offer

Solid and semi-solid patterns

A solid cone fills the spray more evenly. The Danfoss 0.65 × 60 ES at £14.00 (part 030F6314, 4.7 from 56 reviews) is solid kerosene spray at 60°, not 80°. The 0.50 × 80 S at £14.00 (part 030F8908, 4.7 from 161 reviews) prints 1.87 kg/h, not the 1.50 kg/h City Plumbing gives for 0.50 kerosene at 8 bar. Shortlist them on the best oil burner nozzle page only after the letter is known. METERXITY’s £11.99 packs say solid cone B at 60°, with a 9/16-24 UNEF thread. B is not ES, and 3 GPH is not a domestic kerosene rate.

Choosing for your plate

Copy the letter, then the flow and the angle. EH on the plate means buy EH. ES means buy ES. H, S or B means that letter from the family the burner sheet names. Do not correct an H plate to EH because kerosene articles mention EH more often. The 0.50 × 80 S row has 161 reviews, against 59 on the 0.60 EH. If the stamp is polished away, stop.

Symptoms when the pattern is wrong

A wrong letter often shows up as soot, a noisy or unstable flame, or a burner that lights and locks out. Smoke number, carbon dioxide and flue temperature are service instruments, not a glance at the flame. Do not bend electrodes, raise pump pressure or clean the orifice with a pin to compensate. Danfoss says do not touch the orifice. If you smell oil, see smoke, or the burner will not stay alight, turn it off and call a competent person.

Common questions

What does hollow cone mean on a Rayburn or boiler?
It means the spray is weighted toward the edge of the cone. On many UK kerosene plates the letter is EH. Reviews on the 0.65 × 80 EH listing mention a kerosene Rayburn and a Grant Vortex, which shows that owners do search this pattern for those appliances. Your own plate still has to say EH at that flow and angle. Another household’s jet is not your specification.
Is solid more efficient?
Not as a general rule, and not as a claim we can make from these listings. Solid fills the cone more evenly. Hollow loads the rim. The burner manufacturer picked one so the flame matches that chamber and air supply. Changing to solid because it sounds more complete is a spec change, not a saving.
Can I swap EH for ES if flow and angle match?
No. Flow and angle can be identical while the letter still changes the flame shape. A 0.65 US gal/h jet at 60° ES is not a stand-in for a 0.65 at 80° EH, and even a matching angle would still be the wrong pattern. Order the letter that is already stamped.
Where does semi-solid B fit?
B is Danfoss’s semi-solid pattern in the wider light-and-heavy-oil family, between hollow and solid. Buy it when the plate says B. The METERXITY packs say solid cone B at 60° with a 9/16-24 thread. That wording does not turn them into ES kerosene nozzles, and the 3 GPH pack is the wrong flow for a typical house boiler.
Will the wrong pattern soot the heat exchanger?
It can. Oil that is not burned in the shape the chamber expects leaves soot, and a nozzle that passes the wrong amount of fuel makes that worse. OFTEC expects the result to be measured at service. If you already see soot, smell oil or get a lockout, stop and use a competent person rather than trying the other letter.

Related pages

How to replace an oil burner nozzle

Oil burner nozzle

Best oil burner nozzle UK: match the plate, not stars

Oil burner nozzle buying guide: flow, angle, letter

Kerosene oil burner nozzle UK: EH and ES, not diesel

Sources

Public sources named below, taken from the research digest. amazon.co.uk prices, stars and review counts on these twelve listings were taken from the listing files read on 20 October 2026. Page updated October 2026.

  1. Danfoss, Practical tips for oil nozzles (retrieved 20 October 2026)
  2. Danfoss EH/ES oil nozzles, UK design centre (retrieved 20 October 2026)
  3. City Plumbing EH/ES datasheet (retrieved 20 October 2026)
  4. OFTEC, your home guide to liquid fuel heating (retrieved 20 October 2026)
  5. OFTEC, the service (retrieved 20 October 2026)
  6. GOV.UK, competent person schemes (retrieved 20 October 2026)
  7. NHMF, oil-fired appliances (retrieved 20 October 2026)
  8. EOGB on BS 5410-1:2019 and nozzles (retrieved 20 October 2026)