Bosch ZWB35-3 7-738-100-256 Greenstar 131, 131 Input MBtu, 95% AFUE, Wall Mounted Condensing Natural Gas/Liquid Propane Combi Boiler

Broad BTU Output Range: Floor and Wall models
  with 95% AFUE and up to 5:1 modulation are
  available in 5 Heat-Only and 3 Combi sizes

Simplified Installation: Integral pump is standard
  on all models

Unique heat exchanger uses silicon in the alloy
  mixture to reduce service interval to every 5 years,
  maintain high efficiency and dramatically extend
  boiler life.

Combi Models High DHW Output: Up to 4 GPM
  DHW output on Combi models – based on ΔT at
  72°F / 40°C. Large plate heat exchanger allows for
  lower operating temperatures and larger ΔT in
  DHW mode for higher efficiency and condensing
  operation

Many standard venting options: polypropylene
  (PP), flexible PP chimney liner, concentric PP kit,
  PVC or CPVC

Boiler with an integrated system for providing
  tankless domestic hot water

Small, lightweight form factor allows for
  replacement of any wall boiler ease and speed
  with minimal piping and venting changes

All-in-one solution with very low installation effort
  and very few external components

Efficiency is maintained while producing domestic
  hot water, unlike most combi-boilers on the market