Every part of a conversion, three ways.

Unit ~3kg. Diesel is the default UK off-grid choice — cheap, dry, no gas.

• Budget

  2kW diesel heater (clone kit, Vevor)

  generic

  3.5 kgest.≈ £120

  Cheapest way to heat a van. Complete kit. Variable QC, louder, no support. Popular budget choice.

• Mid

  Autoterm Air 2D 2kW kit

  Autoterm (Planar)

  2.9 kg✓ verified£905

  The UK favourite. 2kW, 0.1-0.24 L/h, altitude sensor, E-marked, 7-day support. Kit incl. tank/ducting/exhaust/pump.

• Premium

  Eberspacher Airtronic 2kW

  Eberspacher

  2.8 kgest.≈ £1,150

  Premium OEM diesel heater, factory-fit quality, quiet.

• Premium

  Webasto Air Top 2000 STC 2kW

  Webasto

  2.7 kgest.≈ £1,100

  Premium German OEM-grade, quiet/reliable. May need extra fuel-tap parts. Durability choice.

Unit + gas system; bottle is the real weight. Gas Safe sign-off.

• Premium

  Truma gas blown-air heater

  Truma

  5 kgest.≈ £900
  Needs qualified sign-off (gas/electrical)

  Only if you run gas. Needs flue + certification. Real weight is the bottle (full 6kg Calor ~12kg+).

Empty weight; holds its own water. Gas types need Gas Safe sign-off.

• Budget

  Truma Therme TT2 (5L electric)

  Truma

  2 kg✓ verified≈ £150

  5 L capacity — counts as 5 kg when full

  5L hot water for hands/dishes, 300W + uses air-heater warmth. Not enough for a shower. Empty ~2kg.

• Mid

  Truma electric water heater (14L)

  Truma

  3 kg✓ verified≈ £330

  14 L capacity — counts as 14 kg when full

  14L mains-electric, shower for two. Empty ~3kg, ~17kg full. Needs 230V/hook-up or big power.

• Premium

  Diesel water heater / combi (Autoterm Flow / Truma Combi)

  Autoterm/Truma

  7 kgest.≈ £900

  10 L capacity — counts as 10 kg when full

  Heats water (+ often air) off diesel. Best all-round off-grid hot water. Combi replaces a separate air heater.

• Premium

  Truma Ultrastore BGE 10 (gas+electric)

  Truma

  6 kgest.≈ £400

  10 L capacity — counts as 10 kg when full

  Needs qualified sign-off (gas/electrical)

  10L gas+electric combi — best for off-grid showering (gas heats without hook-up). Gas Safe sign-off.

Hob light (~6kg); gas system real weight is the bottle (~14-17kg full).

• Budget

  Portable 2-burner camping stove

  Coleman/Campingaz

  4 kgest.≈ £45

  Stowable, no install, small canisters. Great for weekenders. No fixed gas system.

• Mid

  Smev 9222 / Dometic HSG 2370 hob+sink

  Dometic/Smev

  5.8 kg✓ verified≈ £250

  Most popular van hob+sink. Twin glass lids, piezo, flame-failure. Runs off gas system.

• Mid

  Dometic Smev PI8022 2-burner hob

  Dometic/Smev

  4.5 kgest.≈ £180

  Hob-only, glass lid, FFD, piezo/12V ignition. Pair with a separate sink.

Hardware; +bottle 14-17kg full. Vented drop-out locker + Gas Safe sign-off.

• Mid

  Gas system: bottle + regulator + vented locker + pipework + bubble tester

  Calor/generic

  4 kgest.≈ £180
  Needs qualified sign-off (gas/electrical)

  THE BOTTLE IS THE REAL WEIGHT: full 6kg Calor propane ~14-17kg (tare 7.7-9kg + 6kg gas). Vented drop-out locker + Gas Safe sign-off.

• Premium

  Refillable LPG system (Gaslow-style)

  Gaslow

  8 kgest.≈ £400
  Needs qualified sign-off (gas/electrical)

  Refill at forecourts, cheaper long-term. Underslung lowers CoG. Gas Safe install recommended.

Light but needs 1500W+ — weight/cost moves to Cat 1 (Heavy electrics).

• Mid

  Single-zone portable induction hob

  generic/Nuvi

  3 kgest.≈ £60

  Gas-free, no CO, great air quality. Light hardware BUT needs 1500W+ inverter + big LiFePO4 (Cat 1).

• Premium

  Twin-zone induction hob

  generic

  4.5 kgest.≈ £160

  Two-ring induction. Only sensible with Heavy electrics (2000W+). Zero gas/flue/certification.

Heavy, space-hungry. Larger vans / full-timers.

• Premium

  Combi hob/grill/oven unit

  Dometic/Thetford

  15 kgest.≈ £600

  Full cooker with oven — heavy, space-hungry, gas or gas/electric. Larger vans / full-timers.

LIGHT. Wool/Thinsulate/recycled/PIR. Barely moves payload.

• Mid

  3M Thinsulate (SM600)

  3M

  5 kgest.≈ £180

  Synthetic, non-off-gassing, hydrophobic, sound-absorbing. Easy to fit, light. Van-build favourite.

Soft-close runners, gas struts, positive catches (or doors fly open driving).

• Budget

  Hinges, gas struts, drawer runners, catches

  Blum/generic

  4 kgest.≈ £80

  Soft-close runners, gas struts for lids, positive catches so doors stay shut driving.

MANDATORY. CO + smoke + LPG gas alarm (if gas). Cheap, light, life-saving.

• Budget

  CO + smoke + LPG gas alarm

  Fireangel/generic

  0.6 kgest.≈ £45

  NON-NEGOTIABLE with cooking/heating/gas. CO alarm (RV-rated), smoke alarm, low-mounted LPG alarm if gas (propane sinks).

Gas to BS EN 1949:2021, Gas Safe engineer sign-off. Cert is ~0kg.

• Budget

  Gas drop-out vent + bubble tester

  generic

  0.3 kgest.≈ £25

  Mandatory low-level drop-out vent under gas locker + bubble tester. Part of a compliant install.

• Mid

  Gas habitation certificate (BS EN 1949:2021)

  Gas Safe engineer

  0 kg✓ verified≈ £120
  Needs qualified sign-off (gas/electrical)

  Any gas: system to BS EN 1949:2021, checked by Gas Safe engineer (LPG/habitation). Required for insurance. The sign-off, not a product.