Filtriraj rezultate
450 W 3300 W 666 W Ne Nema podatka grijalice i radijatori
258 proizvoda
Električni i uljni radijatori, plinske, halogene i električne grijalice. Pogledaj ponudu, usporedi cijene i pronađi najpoovljnije radijatore i grijalice.
![Elit PTC-21](/slike/products/16/45/17734516/thumb80_elit-ptc-21_856e699f.jpeg)
Elit PTC-21
od 56,86 €
3
ponude
Stavi u listu želja
![Elit PTC-22](/slike/products/50/09/48410950/thumb80_elit-ptc-22_b0ca4f72.jpeg)
Elit PTC-22
od 44,10 €
3
ponude
Stavi u listu želja
![Sencor SFH 6020BL](/slike/products/44/09/48410944/thumb80_sencor-sfh-6020bl_4adb223d.jpeg)
Sencor SFH 6020BL
od 8,90 €
5
ponuda
Stavi u listu želja
![Sencor SFH 6021RD](/slike/products/47/09/48410947/thumb80_sencor-sfh-6021rd_7477f083.jpeg)
Sencor SFH 6021RD
od 8,90 €
5
ponuda
Stavi u listu želja
![Palma 1800Z](/slike/products/50/44/17734450/thumb80_palma-1800z_35f1bc87.jpeg)
Palma 1800Z
od 52,50 €
5
ponuda
Stavi u listu želja
![Blaupunkt FHD501](/slike/products/36/09/17710936/thumb80_blaupunkt-fhd501-1800-w_8aad8953.jpeg)
Blaupunkt FHD501
82,10 €
1
ponuda
Stavi u listu želja
![Argo Chic Silver](/slike/products/19/22/17692219/thumb80_argo-chic-silver_6c934bc0.jpeg)
Argo Chic Silver
99,71 €
1
ponuda
Stavi u listu želja
![Noveen hc3299 tuya wifi pametni daljinski Upravljač led Zavnisa Za Grijanje](/slike/products/94/75/46567594/thumb80_noveen-hc3299-tuya-wifi-pametni-daljinski-upravljac-led-zavnisa-za-grijanje_51e9362a.jpeg)
1
ponuda
Stavi u listu želja
![Beha konvektorska LV5](/slike/products/03/10/7381003/thumb80_beha-lv5_ccd5d6ba.jpeg)
Beha konvektorska LV5
1.402,50 €
1
ponuda
Stavi u listu želja
![Luxell LX2832](/slike/products/28/45/17734528/thumb80_luxell-lx2832_e37c14cd.jpeg)
Luxell LX2832
od 35,71 €
2
ponude
Stavi u listu želja
![BM2 EK - 3kW električni grijač zraka](/slike/products/16/00/21330016/thumb80_bm2-ek-3kw-elektricni-grijac-zraka_a20cc733.png)
BM2 EK - 3kW električni grijač zraka
329,06 €
1
ponuda
Stavi u listu želja
![Infracrvena lampa](/slike/products/65/69/24866965/thumb80_infracrvena-lampa_66ef37c4.jpeg)
Infracrvena lampa
38,00 €
1
ponuda
Stavi u listu želja
![Ariston Nimbus Aquaslim](/slike/products/10/65/46066510/thumb80_ariston-nimbus-aquaslim_ccd8542d.jpeg)
Ariston Nimbus Aquaslim
od 354,53 €
4
ponude
Stavi u listu želja
![Blumfeldt Blumfeldt Heat Hunter, grijač na pelete za terasu, 12,2 kW, prijenosni, nehrđajući čelik, crna](/slike/products/46/12/17791246/thumb80_blumfeldt-blumfeldt-heat-hunter-grijac-na-pelete-za-terasu-12_a2cb7370.jpeg)
Blumfeldt Blumfeldt Heat Hunter, grijač na pelete za terasu, 12,2 kW, prijenosni, nehrđajući čelik, crna
od 701,90 €
2
ponude
Stavi u listu želja
![Uništavač komaraca i insekata NEDIS INKI110CBK16, električni](/slike/products/19/61/38216119/thumb80_unistavac-komaraca-i-insekata-nedis-inki110cbk16-elektricni_9ff05465.jpeg)
1
ponuda
Stavi u listu želja
![NOSAČ KUPAONSKIH RADIJATORA N14504](/slike/products/36/57/42045736/thumb80_nosac-kupaonskih-radijatora-n14504_81e6e5b6.jpeg)
1
ponuda
Stavi u listu želja
![Esperanza Sahara EHH003](/slike/products/33/94/5099433/thumb80_esperanza-sahara-ehh003_6483851d.jpeg)
Esperanza Sahara EHH003
17,90 €
1
ponuda
Stavi u listu želja
![Domo DO7327R](/slike/products/49/44/17684449/thumb80_domo-do7327r_2379980e.jpeg)
Domo DO7327R
57,16 €
1
ponuda
Stavi u listu želja
![home Grijalica, grijanje/odmrzavanje, 450W - FKM 450](/slike/products/77/59/11675977/thumb80_home-grijalica-grijanje-odmrzavanje-450w-fkm-450_c471576a.jpeg)
5
ponuda
Stavi u listu želja
![Vaillant aroVAIR VA 2-035 CN](/slike/products/49/60/46266049/thumb80_vaillant-arovair-va-2-035-cn_2d49aeb9.jpeg)
Vaillant aroVAIR VA 2-035 CN
341,66 €
1
ponuda
Stavi u listu želja
![ROBOROCK BHR7969EU Robotski usisavač E5 bijela](/slike/products/09/02/56330209/thumb80_grijalice-i-radijatori-roborock-bhr7969eu-robotski-usisavac-e5-bijela_5275674f.jpeg)
7
ponuda
Stavi u listu želja
![Trotec 2 u 1 Ventilator-grijač TFH 2000 E](/slike/products/30/21/35652130/thumb80_trotec-2-u-1-ventilator-grijac-tfh-2000-e_2df9bc33.jpeg)
1
ponuda
Stavi u listu želja
![Sunred navlaka za salonski grijač siva](/slike/products/26/20/26282026/thumb80_sunred-pokrivalo-za-grelnik-crno_cff909dc.jpeg)
1
ponuda
Stavi u listu želja
![Vaillant VER-100](/slike/products/69/62/686269/thumb80_vaillant-ver-100_4b5dfbe6.jpeg)
Vaillant VER-100
129,15 €
1
ponuda
Stavi u listu želja
![PRIKLJUČNA DOZA BEHA 1F](/slike/products/89/94/42079489/thumb80_prikljucna-doza-beha-1f_230c29b9.jpeg)
PRIKLJUČNA DOZA BEHA 1F
13,50 €
1
ponuda
Stavi u listu želja
![SOMOGYI ELECTRONIC SOMOGYI ELECTRONIC FKF 65221 Zidni ventilator radijator](/slike/products/21/23/17692321/thumb80_somogyi-electronic-somogyi-electronic-fkf-65221-zidni-ventilator-radijator_5487cd3f.jpeg)
1
ponuda
Stavi u listu želja
![Sencor SCF 2101BK](/slike/products/66/65/12506566/thumb80_sencor-scf-2101bk-2000-w_2cd98083.jpeg)
Sencor SCF 2101BK
od 47,93 €
2
ponude
Stavi u listu želja
![Trotec TDS 20 M](/slike/products/51/73/17677351/thumb80_trotec-tds-20-m_2371bafc.jpeg)
Trotec TDS 20 M
od 45,99 €
3
ponude
Stavi u listu želja
![Helios 02522 ventilatorski grijač STH 9 T](/slike/products/62/48/43854862/thumb80_helios-02522-ventilatorski-grijac-sth-9-t_51c3e08.jpeg)
Helios 02522 ventilatorski grijač STH 9 T
1.409,00 €
1
ponuda
Stavi u listu želja
![POSUDA ZA RADIJATOR 706700](/slike/products/86/11/50191186/thumb80_grijalice-i-radijatori-posuda-za-radijator-706700_5512be16.jpeg)
POSUDA ZA RADIJATOR 706700
3,77 €
1
ponuda
Stavi u listu želja
![Beha konvektorska LV12](/slike/products/05/10/7381005/thumb80_beha-lv12_f37c1db8.jpeg)
Beha konvektorska LV12
1.742,50 €
1
ponuda
Stavi u listu želja
![Vaillant VER-75](/slike/products/71/62/686271/thumb80_vaillant-ver-75_6419d244.jpeg)
Vaillant VER-75
122,07 €
1
ponuda
Stavi u listu želja
![STEEL HEATING PANEL WIFII MILL PA400LWIFI3 WHITE](/slike/products/49/45/47284549/thumb80_steel-heating-panel-wifii-mill-pa400lwifi3-white_1edf258f.jpeg)
1
ponuda
Stavi u listu želja
![Trotec uljni TDS 10](/slike/products/53/82/14838253/thumb80_trotec-uljni-tds-10_cc0da7a0.jpeg)
Trotec uljni TDS 10
od 35,99 €
10
ponuda
Stavi u listu želja
![Master Klimatechnik BLP-33M plinski grijač zraka 18000 W, 33000 W](/slike/products/63/61/17736163/thumb80_master-klimatechnik-blp-33m-plinski-grijac-zraka-18000-w-33000-w_6ad4e529.jpeg)
1
ponuda
Stavi u listu želja
![Unold 86445](/slike/products/31/04/7380431/thumb80_unold-86445_e3f6d6a.png)
Unold 86445
94,60 €
1
ponuda
Stavi u listu želja
![ROWI 1 03 03 0407 keramički ventilatorski grijač HKH 1500/2/5 O 45 m³ crna](/slike/products/13/69/32886913/thumb80_rowi-1-03-03-0407-keramicki-ventilatorski-grijac-hkh-1500-2-5-o-45-m-crna_430a7c8f.jpeg)
1
ponuda
Stavi u listu želja
![Luxell LX2811](/slike/products/41/09/48410941/thumb80_grijalice-i-radijatori-luxell-lx2811_d9142dda.webp)
Luxell LX2811
75,52 €
1
ponuda
Stavi u listu želja
![ROWI 1 03 03 0360 brzi grijač za kupku HBS 2000/2/1 60 m³ bijela](/slike/products/98/64/50146498/thumb80_grijalice-i-radijatori-rowi-1-03-03-0360-brzi-grijac-za-kupku-hbs-2000-2-1-60-m-bije_6fd450f5.jpeg)
1
ponuda
Stavi u listu želja
![bimar HP118 ventilatorski grijač HP118 18 m² bijela, siva](/slike/products/37/49/43854937/thumb80_bimar-hp118-ventilatorski-grijac-hp118-18-m-bijela-siva_1f19561f.jpeg)
1
ponuda
Stavi u listu želja
![Pločasti radijator THERMOQUEEN 22K 600/1000 2239,00 W](/slike/products/23/35/45273523/thumb80_plocasti-radijator-thermoqueen-22k-600-1000-223900-w_886aeeed.jpeg)
1
ponuda
Stavi u listu želja
![Master B 35 B 35 grijalica na ulje 80 W žuta/crna boja](/slike/products/86/04/17980486/thumb80_master-direct-dizelski-grelnik_4b5b0da.jpeg)
1
ponuda
Stavi u listu želja
![SIKU IPP450 DW infracrveno grijanje 450 W 7 m² bijela](/slike/products/05/21/37942105/thumb80_siku-ipp450-dw-infracrveno-grijanje-450-w-7-m-bijela_871f4b95.jpeg)
1
ponuda
Stavi u listu želja
![Norveški električni radijator BEHA PV8 WIFI](/slike/products/47/93/17759347/thumb80_norveski-elektricni-radijator-beha-pv8-wifi_629923dd.png)
Norveški električni radijator BEHA PV8 WIFI
1.450,10 €
1
ponuda
Stavi u listu želja
![Trotec TDE 95](/slike/products/35/82/14838235/thumb80_trotec-tde-95_c20514bb.jpeg)
Trotec TDE 95
od 647,00 €
2
ponude
Stavi u listu želja
![Master Klimatechnik BLP-33E plinski grijač zraka 18000 W, 33000 W](/slike/products/94/63/17736394/thumb80_master-klimatechnik-blp-33e-plinski-grijac-zraka-18000-w-33000-w_1449be03.jpeg)
1
ponuda
Stavi u listu želja
![Kamin VONHAUS 2500647, stolni, na bioetanol, sivi 2500647](/slike/products/36/79/20797936/thumb80_kamin-vonhaus-2500647-stolni-na-bioetanol_1663cb7.jpeg)
2
ponude
Stavi u listu želja
![Blumfeldt Blumfeldt Flagranti, plinski grijač, 8 kW, plinska boca do 11 kg, nehrđajući čelik](/slike/products/49/95/55249549/thumb80_grijalice-i-radijatori-blumfeldt-blumfeldt-flagranti-plinski-grijac-8-kw_fbe617d3.jpeg)
Blumfeldt Blumfeldt Flagranti, plinski grijač, 8 kW, plinska boca do 11 kg, nehrđajući čelik
479,90 €
1
ponuda
Stavi u listu želja
![home Okvir za kamin FKKI 03, Bologna, boja drvo - FKKF 03](/slike/products/72/11/23031172/thumb80_home-okvir-za-kamin-fkki-03-bologna-boja-drvo-fkkf-03_e589a09a.jpeg)
1
ponuda
Stavi u listu želja
![ROWI 1 03 03 0382 ventilatorski grijač HHL 1500/2/3 45 m³ bijela, crna](/slike/products/82/60/47736082/thumb80_rowi-1-03-03-0382-ventilatorski-grijac-hhl-1500-2-3-45-m-bijela-crna_fb198422.jpeg)
1
ponuda
Stavi u listu želja
![Helios 02520 ventilatorski grijač STH 3](/slike/products/56/48/43854856/thumb80_helios-02520-ventilatorski-grijac-sth-3_80ed20be.jpeg)
1
ponuda
Stavi u listu želja
![Sunway SWRE 700 IR panel](/slike/products/92/40/26204092/thumb80_sunway-swre-700-ir-panel_d508f360.jpeg)
Sunway SWRE 700 IR panel
196,02 €
1
ponuda
Stavi u listu želja
![home Panel električna grijalica, zidna, 450 W - FKIR 452 19220](/slike/products/85/92/25009285/thumb80_home-panel-elektricna-grijalica-zidna-450-w-fkir-452-19220_352a8b9b.jpeg)
4
ponude
Stavi u listu želja
![Nobø top premium norveški električni radijator podni kotačići](/slike/products/29/34/33133429/thumb80_nob-top-premium-norveski-elektricni-radijator-podni-kotacici_971ad0cb.png)
1
ponuda
Stavi u listu želja
![Grijalica DXCH13 1500 W Bijela](/slike/products/34/86/51768634/thumb80_grijalice-i-radijatori-grijalica-dxch13-1500-w-bijela_db0d2027.jpeg)
Grijalica DXCH13 1500 W Bijela
151,05 €
1
ponuda
Stavi u listu želja
![Trotec TDS 120](/slike/products/62/82/14838262/thumb80_trotec-tds-120_28820b08.jpeg)
Trotec TDS 120
582,25 €
1
ponuda
Stavi u listu želja
![Black+Decker BXCSH1800E convector wall heater](/slike/products/58/31/49793158/thumb80_nekategorizirano-blackdecker-bxcsh1800e-convector-wall-heater_9021c684.jpeg)
1
ponuda
Stavi u listu želja
![Trotec TDS 29 E](/slike/products/87/81/14838187/thumb80_trotec-tds-29-e_c92b4482.jpeg)
Trotec TDS 29 E
od 95,99 €
2
ponude
Stavi u listu želja
![Trotec TDS 20 C](/slike/products/48/73/17677348/thumb80_trotec-tds-20-c_3869d703.jpeg)
Trotec TDS 20 C
od 48,99 €
2
ponude
Stavi u listu želja
![Pločasti radijator THERMOQUEEN 22K 600/0700 1567,30 W](/static/slike/blank_150x150.jpg)
1
ponuda
Stavi u listu želja
![Pločasti radijator THERMOQUEEN 22K 600/0600 1343,40 W](/slike/products/17/35/45273517/thumb80_plocasti-radijator-thermoqueen-22k-600-0600-134340-w_323b9c7a.jpeg)
1
ponuda
Stavi u listu želja
![KUP.RADIJATOR TERMABAD R01 BLACK, 1222x500 mm, 552 W, CRNI, SREDNJI PRIKLJUČAK, G626487](/static/slike/blank_150x150.jpg)
1
ponuda
Stavi u listu želja
![Trotec uljni TDS 20 R](/slike/products/02/82/14838202/thumb80_trotec-uljni-tds-20-r_f307a6dc.jpeg)
Trotec uljni TDS 20 R
od 60,99 €
2
ponude
Stavi u listu želja
![Vaillant VER-250](/slike/products/93/53/9865393/thumb80_vaillant-ver-250_112b2871.jpeg)
Vaillant VER-250
192,72 €
1
ponuda
Stavi u listu želja
![Trotec Keramik-Heizlüfter TFC 17 E](/slike/products/23/16/35651623/thumb80_trotec-keramik-heizlufter-tfc-17-e_f541b1ff.jpeg)
1
ponuda
Stavi u listu želja
![Pločasti radijator THERMOQUEEN 22K 600/1600 3582,40 W](/slike/products/03/36/46963603/thumb80_plocasti-radijator-thermoqueen-22k-600-1600-358240-w_4c3c9415.jpeg)
1
ponuda
Stavi u listu želja
![Električni konvektor Electrolux ECH/AT-1500 3AI-W EEC](/slike/products/49/39/39903949/thumb80_elektricni-konvektor-electrolux-ech-at-1500-3ai-w-eec_ff30e4ff.jpeg)
1
ponuda
Stavi u listu želja
![Master BLP 73 M plinski grijač zraka 73 kW žuta/crna boja](/slike/products/47/33/37283347/thumb80_master-blp-73-m-plinski-grijac-zraka-73-kw-zuta-crna-boja_a96b4f5d.jpeg)
1
ponuda
Stavi u listu želja
![Trotec Dizajn grijač IRS 3020](/slike/products/66/24/35652466/thumb80_trotec-dizajn-grijac-irs-3020_371480e2.jpeg)
Trotec Dizajn grijač IRS 3020
95,99 €
1
ponuda
Stavi u listu želja
![PCE Instruments PCE-HM 250 #####Heizhaube PCE-HM 250](/slike/products/41/52/43275241/thumb80_pce-instruments-pce-hm-250-heizhaube-pce-hm-250_a3a9be61.jpeg)
1
ponuda
Stavi u listu želja
![ROWI 1 03 03 0234 keramički ventilatorski grijač HKG 2000/2/1 60 m³ crna](/slike/products/25/69/32886925/thumb80_rowi-1-03-03-0234-keramicki-ventilatorski-grijac-hkg-2000-2-1-60-m-crna_1618b0f4.jpeg)
1
ponuda
Stavi u listu želja
![Blumfeldt Blumfeldt Goldflame Deluxe grijalica za terasu](/slike/products/24/85/57188524/thumb80_grijalice-i-radijatori-blumfeldt-blumfeldt-goldflame-deluxe-grijalica-za-terasu_2ff63e0.jpeg)
2
ponude
Stavi u listu želja
![Pločasti radijator THERMOQUEEN 22K 600/1500 3358,50 W](/static/slike/blank_150x150.jpg)
1
ponuda
Stavi u listu želja
![Master BLP 53 M plinski grijač zraka 53 kW žuta/crna boja](/slike/products/26/21/37282126/thumb80_master-blp-53-m-plinski-grijac-zraka-53-kw-zuta-crna-boja_dedd0c36.jpeg)
1
ponuda
Stavi u listu želja
![Blumfeldt Blumfeldt NA Lavastone, grijač za terasu, 34.000 BTU / 10 kW, kaljeno staklo, čelik](/slike/products/17/56/50435617/thumb80_nekategorizirano-blumfeldt-lavastone-terasni-grelec-blumfeldt_a132dcec.webp)
Blumfeldt Blumfeldt NA Lavastone, grijač za terasu, 34.000 BTU / 10 kW, kaljeno staklo, čelik
215,90 €
1
ponuda
Stavi u listu želja
![Domo DO7341H](/slike/products/83/12/17721283/thumb80_domo-do7341h-2000-w_bd945b0b.jpeg)
Domo DO7341H
88,26 €
1
ponuda
Stavi u listu želja
![Dimplex 376420 brzi grijač za kupku H 260E bijela](/slike/products/35/48/45114835/thumb80_dimplex-376420-brzi-grijac-za-kupku-h-260e-bijela_19a1a376.jpeg)
1
ponuda
Stavi u listu želja
Proizvođač
Adler (2)
Linea (0)
AEG (1)
Luxell (2)
Aeno (0)
Magnohrom (2)
Airelec (0)
Master (8)
Alpina (0)
Meross (2)
Ardes (0)
Mesko (0)
Argo (3)
Mill (2)
Ariete (1)
Nedis (0)
Ariston (1)
Neo (0)
Atlantic (0)
Noveen (0)
Beha (7)
Ohyama (0)
Beko (0)
Olimpia Splendid (0)
Beper (0)
oneConcept (0)
Bewello (0)
Orion (0)
Black & Decker (0)
Palma (1)
Blaupunkt (1)
Radialight (1)
Blitz (0)
Rowenta (0)
Blumfeldt (12)
Sencor (5)
Bosch (1)
Shumee (1)
Camry (0)
Siku (3)
Cecotec (2)
Simfer (0)
Connect XL (0)
Somogyi (0)
Cordys (0)
Stadler Form (2)
DeLonghi (1)
Stanley (0)
Dimplex (2)
Steba (2)
Domo (3)
Stiebel Eltron (2)
ECG (0)
SunDirect (1)
Einhell (3)
Sygonix (0)
Electrolux (3)
Tansun (0)
Elit (3)
Teesa (0)
Esperanza (1)
Tesla (0)
ETA (0)
Tesy (1)
Falcom (1)
Thermor (0)
Fenix (0)
Trisa (1)
First (0)
Tristar (0)
Floria (0)
Trotec (25)
G3 Ferrari (0)
Ufesa (0)
Gorenje (0)
Unold (5)
Hausmeister (0)
Vaillant (6)
Heinner (0)
Viessmann (0)
Heller (0)
Vivax (0)
Home (6)
Volino (0)
Honeywell (0)
VonHaus (3)
Imetec (0)
Xiaomi (1)
Iskra (1)
Yato (1)
Klarstein (3)
Zilan (0)
Kumtel (2)
Nema podatka (121)
Snaga
000 W - 430 W (64)
000 W (5)
100 W (2)
150 W (2)
167 W (1)
200 W (2)
230 W (1)
235 W (1)
250 W (2)
274 W (1)
280 W (1)
300 W (3)
320 W (3)
340 W (1)
344 W (1)
350 W (9)
357 W (1)
360 W (3)
375 W (1)
379 W (1)
380 W (1)
386 W (1)
400 W (18)
402 W (1)
426 W (1)
430 W (1)
450 W - 650 W (91)
450 W (6)
460 W (1)
480 W (2)
495 W (1)
500 W (25)
526 W (1)
530 W (1)
531 W (1)
533 W (1)
540 W (1)
550 W (1)
552 W (1)
558 W (1)
568 W (1)
577 W (1)
580 W (2)
593 W (1)
600 W (31)
607 W (1)
624 W (1)
633 W (1)
634 W (1)
647 W (1)
650 W (7)
666 W - 1038 W (209)
666 W (1)
668 W (1)
700 W (19)
708 W (1)
720 W (4)
732 W (1)
737 W (1)
750 W (20)
770 W (3)
800 W (23)
810 W (1)
821 W (1)
829 W (1)
830 W (1)
850 W (1)
900 W (14)
931 W (1)
960 W (3)
962 W (1)
968 W (1)
980 W (1)
993 W (1)
1000 W (103)
1020 W (4)
1038 W (1)
1075 W - 2250 W (661)
1075 W (1)
1100 W (3)
1126 W (1)
1150 W (1)
1200 W (65)
1250 W (6)
1276 W (4)
1300 W (3)
1400 W (5)
1500 W (122)
1531 W (4)
1600 W (6)
1610 W (1)
1650 W (1)
1700 W (2)
1800 W (34)
1804 W (1)
1850 W (2)
2000 W (367)
2060 W (1)
2061 W (1)
2100 W (10)
2200 W (18)
2250 W (2)
2300 W - 15000 W (148)
2300 W (5)
2310 W (1)
2400 W (18)
2406 W (1)
2408 W (1)
2500 W (74)
2700 W (1)
2720 W (1)
2800 W (3)
3000 W (16)
3120 W (1)
3300 W (1)
3500 W (1)
4200 W (5)
4500 W (1)
5000 W (3)
5500 W (1)
5852 W (1)
6000 W (1)
7741 W (1)
9000 W (4)
12000 W (2)
15000 W (5)
Nema podatka (250)
Moglo bi te zanimati i
Evo zašto svi pričaju o konvektorskim grijalicama