Those that show the %efficiency are proud of the number while those doesn't mostly are not so proud about it.

Which brand are looking at? From my previous research during my renovation, most popular brands in Malaysia like Electrolux and Fotile did advertise their efficiency.

Highest heat in standalone stove is probably commercial stove- Rinnai RTL35K 6.75kW gas input :excl:

For built in hob see if you can get a bigger gas input than these 5.5kW:
Rinnai RB-72G / Rinnai RB-72S

Basic gas stove is around 3.6kW
Entry level rinnai hob about 3.7kW
Midrange rinnai 2-burner hob 4.5kW

A three burner hob will likely be too cute in terms of flame power and cramped.

Else it might be more practical to go with 2 (or 3) units of the standalone stove, spaced out, for triple maximum simultaneous wok hei possible.

Your 450mm pot may benefit from big diameter stove, I can think of Senz Tri-ring burner that have output of 6.4kw, its really huge.
But it is not practically spaced out with hob size of just 710mm

Maybe you need a standalone gas hob to cater your needs, 450mm is really huge for double burner, I think the large one only about 900 width

With Pot size 450mm U may even consider some commercial used high pressure gas stove for better firepower, those definitely can give you some wok hei

if two 450mm = 900mm already. i dont think u really need two 450mm. Pan usually 300mm only.
Kitchen hood by standard is 900mm, so hob usually is smaller or max 900mm. putting two 450mm is hard to get. standard wok at home 400mm+- and pan 300mm+- so total 700mm only.

Fotile GAG 86210 would b a good choice, efficiency more than 60% and tested to b stronger than many brands rated 5.5kW

However, if u really have a 450mm wok those really restaurant big wok and u need super strong flame then may b buying two standalone hob, rinnai commercial hob super powerful. However this is overkill for many homecooks, i m using old fotile model rated 3.8kW and it is actually very powerful for me d, latest model 4.85 to 5kW lagi power. Btw dont 100% trust kW spec as many low end brand overstate their kW to make them look powerful

https://www.rinnai.com.my/product/commercia...cooker/rtl-35k/

if u r making a new hole then any hob will do, but if u r looking for replacement then u need to look for flexi size.

Why r they FLEXI? the bottom of the hob got free space and supported by metal frame while FIXED cut out not much free space, burners are max furthers apart each other so no more free space.

EG : A hob with 86cm fixed (burners distance may b ard 44cm center to center) but if it is a 860mm flex hob, then burners might b 40 - 42cm only, so u have more free space left and right)

Replaced our 10 year old Rinnai RB 3SI inner flame unit (after finding much difficulty in getting their service personnel to come over) with Fotile GAG86210.

Impressed by the superior flame control, the gas knob has good resistance to it (similar to volume knob on AV receiver), makes it very much easier to control flame.

The Rinnai was a flexi cut out design, versus this Fotile. Had to do some hole size modification, to get this fitted in.

Rinnai after sales became worst after the MCO, hence decided not to go back for Rinnai.

Also, Rinnai is still selling my exact same model from 10 years ago but the price has increased by more than 40%.
As for Heat Efficiency, I'm not sure how to compare. Fotile mentions 60% efficiency from the rated input.

Rinnai's innner flame series, do not have similar heating prowess as a standard burner type and it would be unfair to compare the Rinnai against something that is very different. We were using the inner flame series from Rinnai. Would strongly advise against this model, if you do a lot of cooking. Firstly, for deep frying the heat isn't really sufficient and secondly, if you do a lot of frying, grease accumulates on the inner parts of the burner. Since it's semi open by design, insects etc can built nest or die inside the burner.

schott brand only, it is also tempered glass only

fotile tempered glass is supported with 0.8mm aluminium sheet while most brands only use aluminium foil

erm rinnai warranty 2 years
fotile 1 year, not much big difference also ahah jus extra 1 year. fotile now dec sale giving 10 years warranty for tempered glass

gag86210 confirm powerful

To be honest, no gas stove will have issues within 2 years warranty period. Ignition failure usually occurs much earlier; all our stoves including our free standing cooker Zanussi and cheap Faber hob before the Rinnai; never had ignition issues. Zanussi had valve failure on one of the burners after 7 years of use.

Faber had gas leak due to cracked burner (not the ring, burner itself cracked); lasted about 10 years when the burner crack happened; flame will come out from below the burner due to leaking gas.

Rinnai's only issue after all those years is the poor design of inner flame series; it is fully serviceable but with scarce service personnel; its just as good as useless.

I personally find Fotile's flame is stable, high powerful flame stability can be achieved by many hobs; the true test is when you want to reduce the big flame to simmer (many falter and fail, even the Rinnai, as somehow the flame will become yellow (gas / oxygen mixture not right) once you reduce to lower low flame setting (I believe this is only achievable by Fotile EPS Series burners, not sure if Superflame can get the same results or not)

On the Fotile, so far we are able to reduce the flame to simmer easily due to the resistance on the control valve itself; if you can test Rinnai valve (RB-3SI) & Fotile Valve; you can sense the difference.

"Branded" hobs usually won't have much effect on the glass surface; though, there have been cases of shattered glass top on Rinnai Inner Flame series. Ours was Stainless Steel; as initially this Rinnai was purchased to replace a large cut out Faber hob and the person who sold us; recommended to get the Stainless steel top as it is more rigid compared to the glass top version (which can flex and may cause the glass to shatter eventually).

Rinnai Inner flame is as per below; burner ring sits below the surface and fire comes from "within" much like a volcano heat.

erm rinnai warranty 2 years
fotile 1 year, not much big difference also ahah jus extra 1 year. fotile now dec sale giving 10 years warranty for tempered glass

gag86210 confirm powerful