Boilers

HTP Elite Premier EP-110 Condensing Boiler

Name: HTP Elite Premier EP-110 Condensing Boiler
Brand: HTP (Heat Transfer Products)

HTP (Heat Transfer Products) EP-110Wholesale contractor 44% data complete

Price not yet sourced

we haven't found a defensible price

Installed price on hydronic work varies more by market, existing-system condition and contractor than by brand. Several products in this catalog explicitly recommend getting at least two contractor quotes for this reason.

Floor-mount, space-heating-only condensing boiler with the highest AFUE in this catalog, paired with a separate indirect tank for domestic hot water.

Our take

HTP is a smaller, less consumer-visible brand than Navien or Rheem, but 96.4% AFUE is genuinely the top of this catalog. Being heat-only rather than combi is itself a legitimate answer to this category's own regret pattern: our research found repeated trade complaints that combi units struggle under simultaneous domestic-hot-water and space-heating demand — pairing a heat-only boiler with a dedicated indirect tank sidesteps that failure mode entirely, at the cost of floor space for the tank.

Best for

Homes with room for an indirect tank where peak AFUE and separating heating from domestic hot water duty both matter.

Watch out for

HTP also sells water heaters under the same 'Elite Premier' name (SKU prefix HEP-, not EP-) — don't let a quote or a parts order confuse the two product lines.

Compare against

Lochinvar Knight Fire Tube Condensing Boiler

Fire-tube condensing boiler with 10:1 turndown, built for the residential and light-commercial hydronic market.

Navien NFC-175 Condensing Combi Boiler

High-turndown condensing combi boiler providing both hydronic heat and domestic hot water from one wall-hung unit.

Viessmann Vitodens 100-W Condensing Boiler

German-engineered condensing boiler with a stainless Inox-Radial heat exchanger and a 10:1 turndown ratio in line with the rest of this catalog's condensing boilers.

Weil-McLain Evergreen Condensing Boiler

Stainless condensing boiler from the most established US residential boiler brand.

Before you buy this

Ask about turndown ratio, not just efficiency — a boiler that can't modulate down to your house's actual heat loss on a mild day short-cycles, and short-cycling is what wears a boiler out early. Confirm whether your radiators or baseboard were sized for the supply temperature this boiler will actually deliver. And ask for a heat-loss calculation instead of matching the old unit's output.

Specifications

Efficiency

How efficiently it turns fuel into heat, under lab conditions?

96.4%% AFUE -- the top of what any boiler in this catalog reaches, but every other listing here is within a couple of points, so this is not the number to decide on

Manufacturer submittal and specification sheets · tier 3

96.4%

AFUE

Every boiler in this catalog condenses and sits within about a point and a half of every other one. This catalog's own buying guide puts it plainly: two boilers can share a 95% AFUE rating and behave completely differently on a 45F day, because AFUE says nothing about turndown -- see modulation_ratio for the number that actually separates them.

Sizing

How much heat it's rated to deliver?

Rated at 110,000 BTU/h BTU/h. This number only means something matched against an actual heat-loss calculation for your house -- see the fit model note on oversizing below before treating a bigger number as better

Manufacturer submittal and specification sheets · tier 3

110,000 BTU/h

Rated capacity

Sizing to the old boiler's nameplate instead of a real heat-loss calculation is this category's single most common and most consequential regret -- see the oversizing_short_cycling cluster in this dossier.

Design

How gently it can run on a mild day?

A 10:1:1 turndown -- can throttle to roughly a tenth of full output, so it runs long and low on a mild day instead of cycling on and off

Manufacturer submittal and specification sheets · tier 3

10:1

Turndown ratio

This is the number this catalog's own buying guide identifies as the real efficiency differentiator -- not AFUE, which barely varies across this catalog at all. It only pays off if the installer actually commissions outdoor reset; an uncommissioned high-turndown boiler delivers none of this advantage.

Space heating only, or space heating plus hot water in one box?

Combi -- makes both heat and domestic hot water from one wall-hung unit. Saves floor space and a second appliance, at the cost of a ceiling on simultaneous hot-water demand.

Manufacturer submittal and specification sheets · tier 3

Combi (heat + domestic hot water)

This catalog's own research and its own buying guide agree on where the line sits: roughly one or two bathrooms and a modest household is fine for a combi; three-plus bathrooms or a large family should look at a heat-only boiler with an indirect tank instead. No spec sheet discloses how gracefully a given combi's mixing valve handles a second shower opening mid-draw -- that's a real, undisclosed gap, not a solved problem.

Every value above is stored with the document it came from and the date it was read. How we resolve conflicting sources →